USRE42950E1 - Copy prevention method and apparatus for digital video system - Google Patents
Copy prevention method and apparatus for digital video system Download PDFInfo
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- USRE42950E1 USRE42950E1 US10/737,671 US73767103A USRE42950E US RE42950 E1 USRE42950 E1 US RE42950E1 US 73767103 A US73767103 A US 73767103A US RE42950 E USRE42950 E US RE42950E
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/91—Television signal processing therefor
- H04N5/913—Television signal processing therefor for scrambling ; for copy protection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/91—Television signal processing therefor
- H04N5/913—Television signal processing therefor for scrambling ; for copy protection
- H04N2005/91307—Television signal processing therefor for scrambling ; for copy protection by adding a copy protection signal to the video signal
- H04N2005/91328—Television signal processing therefor for scrambling ; for copy protection by adding a copy protection signal to the video signal the copy protection signal being a copy management signal, e.g. a copy generation management signal [CGMS]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/91—Television signal processing therefor
- H04N5/913—Television signal processing therefor for scrambling ; for copy protection
- H04N2005/91357—Television signal processing therefor for scrambling ; for copy protection by modifying the video signal
- H04N2005/91364—Television signal processing therefor for scrambling ; for copy protection by modifying the video signal the video signal being scrambled
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/79—Processing of colour television signals in connection with recording
- H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
- H04N9/804—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components
- H04N9/8042—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components involving data reduction
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/79—Processing of colour television signals in connection with recording
- H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
- H04N9/804—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components
- H04N9/806—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components with processing of the sound signal
- H04N9/8063—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components with processing of the sound signal using time division multiplex of the PCM audio and PCM video signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/79—Processing of colour television signals in connection with recording
- H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
- H04N9/82—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only
- H04N9/8205—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only involving the multiplexing of an additional signal and the colour video signal
Definitions
- the present invention relates to a copy prevention technology for a digital video system, and more particularly, to a copy prevention method and apparatus for a digital VCR to which encryption is introduced to display a picture only in a VCR internally containing a corresponding encryption code, thereby preventing tape from being copied.
- U.S. Pat. NO. 4,819,098 discloses a method in which an interference signal is inserted into a video waveform in an automatic gain control circuit (AGC) of a VCR.
- AGC automatic gain control circuit
- the inserted signal does not affect the AGC of its monitor but has the AGC of the VCR record an accurate level of signal on a video tape.
- an MPEG bit stream received by a digital VCR is constructed to transmit a transport header, packetized elementary stream (PEG) (PES) header and audio and video data respectively or simultaneously.
- PEG packetized elementary stream
- the PES header contains a PES header flag area of 14 bits which is a field for DSM such as digital VCR, and a PES header field having a variable length.
- the PES header flag area includes 1-bit copyright (CR) flag, 1-bit original-or-copy (OC) flag, 2-bit PD flag, 1-bit TM flag, and 1-bit AC flag.
- the PES header field varies in length, and part thereof is set by the PC PD, TM and AC flags.
- a PTS/DTS area is not present if the value of the PD flag is “00”. It is 40 bits if the value “10”. If the value is “11”, the area is 80 bits.
- a DSM trick mode field is not present if the TM flag is “0”. If the flag is “1”, the field is 8 bits.
- An additional copy information field is 8 bits if the AC flag is “1”.
- This public-key encryption system has all users U hold unique encryption algorithm E PK U and description algorithm D PK U .
- encryption algorithm E PK U for the public-key is opened as a public-key to key supply portion 107 .
- Decryption algorithm D PK U for secret key is kept in secret.
- the characteristics of E PK U and D PK U are as follows.
- encryption algorithm E PK U and decryption algorithm D PK U do not require complicated calculation.
- the public channel indicates a channel in which transmitted data is not kept in secret.
- D PK B corresponding to encryption algorithm E PK B
- D PK B corresponding to encryption algorithm E PK B
- a copy prevention method for a digital video system comprising the steps of: (a) adding a header area of a header start code and key field to a reproduced bit stream; (b) decrypting and transmitting the bit stream to which the header area is added; (c) detecting a key field of the decrypted and transmitted bit stream and detecting copy prevention information; and (d) encrypting the bit stream according to information detected from step (c) and recording it on tape.
- a copy prevention apparatus for a digital video system comprising: a reproduction block for adding key information to a reproduced bit stream, and decrypting and transmitting it; and a recording block for searching key information of the bit stream transmitted from the reproduction block is to extract copy prevention information, and encrypting and recording the bit stream according to the extracted copy prevention information.
- the reproduction block comprises: reproduction means for reproducing data recorded on tape; key insertion means for adding key information to the bit stream of the reproduction means; and decryption means for decrypting the output of the key insertion means and transmitting it to a recording-side VCR.
- the recording block comprises: key detecting/correcting means for detecting key information from the transmitted bit stream of a reproducing-side VCR: copy prevention information detecting means for searching the key information detected from the key detecting/correcting means to detect copy prevention information; encrypting means for encrypting the bit stream according to the copy prevention information of the copy prevention information detecting means; and recording means for recording the bit stream encrypted in the encrypting means.
- the copy prevention information detecting means comprises: a PES header detecting portion for detecting a PES header from parallel data output from the key detecting/correcting means; and a copy prevention information extractor enabled by a PES header detection signal of the PES header detecting portion to detect an additional copy information field.
- FIG. 1 is a block diagram of a conventional packet processing apparatus
- FIG. 2 shows an example of a general transmission stream
- FIG. 3 is a block diagram of a conventional public-key encryption system
- FIG. 4 shows connections of systems of the present invention
- FIG. 5 is a block diagram of a copy prevention apparatus for a digital video system of the present invention.
- FIG. 6 is a block diagram of the copy prevention information detector of FIG. 5 ;
- FIG. 7 is a circuit diagram of the PES header detector of FIG. 6 ;
- FIGS. 8A-8F are waveform diagrams of input/output at the respect respective portions of FIG. 7 ;
- FIG. 9 is a circuit diagram of the copy prevention information extractor of FIG. 4 ;
- FIGS. 10A-10G are waveform diagrams of input/output at the respective portions of FIG. 9 ;
- FIGS. 11A-11D show examples of a bit stream of the present invention.
- a copy prevention apparatus of the present invention comprises a reproducing portion 1 for reproducing data recorded on tape, a key inserting portion 2 for adding a tape header start code and key field at the front end of a bit stream of reproducing portion 1 , a decrypting portion 3 for decrypting the output of key inserting portion 2 and transmitting it as parallel data, a key detecting/correcting portion 4 for detecting a key field from the parallel data transmitted from decrypting portion 3 , a copy prevention information detecting portion 5 for detecting a PES header from the key field detected and extracting copy prevention information, a copy prevention information correcting portion 6 for correcting the output of copy prevention information detecting portion 5 if necessary, an encrypting portion 7 for encrypting the output of copy prevention information correcting portion 6 , and a recording portion 8 for recording the output of encrypting portion 7 on tape.
- copy prevention information detecting portion 6 5 comprises a PES header detecting portion 10 for searching the parallel data in synchronization with a clock clk to detect the PES header, and a copy prevention information extractor 20 enabled by the PES header signal of PES header detecting portion 10 to detect the copy prevention information field.
- PES header detecting portion 10 comprises first and second flipflops 11 and 12 for sequentially delaying the parallel data according to clock elk clk, a packet start code detector 13 for searching the parallel data and the output of first and second flipflops 11 and 12 to detect the packet start code of the PES header, a stream ID detector 14 for searching the output of second flipflop 12 to detect the stream ID of the PES header, a delay 15 for sequentially delaying the output is-pscp of packet start code detector 13 according to clock clk, and a detection signal generator 16 for logically multiplying the outputs of delay 15 and stream ID detector 14 and outputting a PES header detection signal is-PES-header.
- copy prevention information extractor 20 comprises a D-flipflop 21 for holding the parallel data output from PES header detector 10 , a D-flipflop 22 for holding PES header detection signal is-PES-header of PES header detector 10 , a D-flipflop 23 cleared by the output of D-flipflop 22 and holding voltage (+5V) by a CR signal of the output of D-flipflop 21 and outputting a signal LCR, a D-flipflop 24 cleared by the output of D-flipflop 22 and holding voltage (+5V) by an OC signal of the output of D-flipflop 21 and outputting a signal LOR LOC, a copy prevention information position operator 25 for searching the parallel data of PES header detector 10 and calculating the position of an additional copy information field, a counter 26 for counting the output of copy information position operator 25 , and a D-flipflop 27 for holding the additional copy information field of the output of D-flipflop 21 .
- an MPEG bit stream reproduced from VCR A is input to a satellite receiver or high-definition TV so that it cannot be recognized whether the stream is displayed on a screen or input to VCR B and recorded on another video tape.
- VCR B analyzes this information which is recorded with the bit stream.
- the insertion position of the copy prevention information contained in a GA bit stream is very limited because it must not affect decoding of the decoder of the satellite receiver or high-definition TV so that an image is displayed normally on a monitor.
- the copy prevention information may be inserted into the front end of the MPEG bit stream or inside the PES header.
- the respective GOPs are classified by their cop GOP start codes. This is useful in transmitting initialization data to a recording-side VCR because decoding is never affected even when a slight amount of data is added to the front end of the MPEG bit stream.
- the case of inserting the copy prevention information into the PES header is useful in repeated transmission of information because copy prevention of a recording medium such as DSM is decided using CR and OC flaps of the PES header and additional copy information field. In this case, there are a variety of copy preventing methods.
- VCR B is not able to enter its recording mode.
- VCR B records but “No Copy” mode is recorded in the additional copy information field to interrupt recopying from a copying tape. This means that a secondary source tape can be made, but a third source tape cannot.
- VCR A For “Back-up Copy”, tape B copied from VCR B is reproducible normally only in VCR A. According to this method, reproducing-side VCR A encrypts the bit stream with its own inherent key and records it on tape so that only reproducing-side VCR A decrypts the MPEG bit stream recording on the tape. For every VCR set, a unique key is provided, encrypted by VCR's key and recorded on tape B. However, the VCR set for recording tape B is VCR B and tape B is encrypted by VCR A's key so that VCR A's key needs to be transmitted to VCR B with GA bit stream.
- the position of the additional copy information field is varied within the PES header according to whether presentation time stamp (PTS)/Decoding time stamp (DTS) and DSM trick mode field are present or not. This varied position must be compensated.
- information transmitted through the additional copy information is a copy prevention method to be performed by recording-side VCR B.
- a header area added to the front of the MPEG bit stream is formed with a tape header start code, that is, the header identifier code, and a key field for storing key information.
- encryption blocks are classified by the packet start code prefix and stream ID of the PES header.
- the encryption block is a basic unit of encryption and can change whether encryption is performed in units of the encryption block, and encryption algorithm and key selection.
- the encryption blocks must not be encrypted until the additional copy information field of the PES header. Encryption is performed until the end of the encryption block after the additional copy information field.
- the first ‘transmission header’ is not encrypted.
- reproducing-side VCR A decrypts it using the key information of the key field so as to make message m. Its key information is added to the header and transmitted in the format of FIG. 11C .
- Recording-side VCR B records the key information transmitted from reproducing-side VCR A on the header of copying tape B and then records the encrypted bit stream.
- a public-key encryption may be employed to the system because the information may be exposed to a pirate.
- Such public-key encryption system ensures the secret of data even though the public-key is exposed but cannot be processed in real-time due to a great amount of calculation. Therefore, this system is not improper when the MPEG bit stream is encrypted directly.
- the “Back-up Copy” can be implemented when the MPEG bit stream is encrypted using a block-cipher algorithm or stream-cipher algorithm such as DES and a key used is encrypted in the public-key encryption.
- every VCR u incorporates encryption algorithm E PK U corresponding to the public-key and decryption algorithm D PK U corresponding to the secret key.
- Encryption algorithm E PK U takes a power key of VCR u, and decryption algorithm D PK U an internal key of VCR U.
- the internal key may be opened to the public.
- Reproducing-side VCR A transmits the internal key on the key field of the header because another VCR encrypts using the internal key.
- Recording-side VCR B randomly selects a key Y used in the block-cipher algorithm such as DES and encrypts it with the public-key encryption system using an external key E PK A . The result is recorded on the key field of copying tape B.
- the data is divided into encryption blocks and encrypted and recorded in the block-cipher algorithm using key Y.
- the bit stream of FIG. 11D is recorded on copying tape B.
- reproducing portion 1 When playback starts for tape copying, reproducing portion 1 detects data recorded on tape as shown in FIG. 11A , and amplifies it by a predetermined level. As shown in FIG. 11B , key inserting portion 2 adds a header having a tape header start code and key field to the GA bit stream of reproducing portion 1 shown in FIG. 11A . Copy prevention information is loaded on the additional copy information field of the PES header to form a format shown in FIG. 11C .
- decrypting portion 3 decrypts the bit stream formed in key inserting portion 2 and transmits it as parallel data to the recording-side VCR via an interface.
- key detecting/correcting portion 4 detects the key field added to the bit stream and corrects the key field if necessary.
- Copying prevention information detecting portion 5 searches the PES header area to detect the additional copy information field.
- redundancy is provided in several areas of the bit stream to increase reliability of information transmitted.
- Copy prevention information detecting portion 5 extracts the value of AC flag from the PES header flag in order to calculate the position of the additional copy information field because it varies within the PES header.
- encrypting portion 7 performs encryption using the block-cipher algorithm such as DES.
- copy prevention information correcting portion 6 performs correction while the input data is stored in a RAM. Accordingly, encrypting portion 7 records the encrypted bit stream on tape in recording portion 8 . Because the key information of the reproducing-side VCR is added on the copying tape, only a VCR having this key information can reproduce tape normally.
- PES header detecting portion 10 searches the output of key detecting/correcting portion 4 and outputs a header detection signal is-PES-header. After header detection signal is-PES-header is input, copy prevention information extractor 20 detects the additional copy information field and OC and CR flags.
- PES header detector 10 for detecting the PES header is formed as shown in FIG. 7 .
- bit stream data_in is input as shown in FIG. 8A
- first flipflop 11 synchronized to clock clk is delayed for a predetermined time to output the bit stream delayed as shown in FIG. 8B .
- Second flipflop 12 delays the output of first flipflop 11 by are predetermined time and outputs the bit stream delayed as shown in FIG. 8C .
- packet start code detecting portion 13 searches the bit stream shown in FIG. 8A and the output of first and second flipflops 11 and 12 shown in FIGS. 8B and 8C in order to detect the packet start code of the PES header.
- detection signal is-pscp is output as shown in FIG. 8D
- delay 15 in which flipflops are coupled at multi-stages delays it sequentially according to clock clk.
- stream ID code detector 14 searches the output of second flipflop 12 and detects the stream ID area of the PES header. Then, detection signal is-sid shown in FIG. 8E is output to detection signal generator 16 . Detection signal generator 16 logically multiplies the outputs of delay 15 and stream ID code detector 14 , and the flipflops hold the output of the AND gate according to clock clk so that PES header detection signal is-PES-header is output to copy prevention information extractor 20 , as shown in FIG. 8 P 8F.
- copy prevention information extractor 20 for detecting the copy prevention information is formed as shown in FIG. 9 .
- D-flipflop 22 synchronized to PES header detection signal is-PES-header of PES header detector 10 shown in FIG. 8F holds voltage +5V so that a HIGH signal is output to the clear ports of D-flipflops 23 , 24 and 27 to release the clear states.
- D-flipflop 23 is synchronized to the CR flag or the output of D-flipflop 21 shown in FIG. 10B to hold voltage Vcc so that a HIGH signal LCR is output as shown in FIG. 10C .
- D-flipflop 24 is synchronized to the OC flag of the output of D-flipflop 21 to hold voltage Vcc so that a HIGH signal LOC is output as shown in FIG. 10D .
- Copy prevention position detector 25 searches the PD, TM and AC flags of the parallel data of PES header detector 10 shown in FIG. 10A to calculate the position of the additional copy information field, which is output to counter 26 as shown in FIG. 10E .
- Counter 26 receiving the 4-bit value performs counting so that a HIGH signal is output as shown in FIG. 10F at a predetermined counting value.
- D-flipflop 27 synchronized to HIGH output rco of counter 26 holds the additional copy information field from the parallel data of D-flipflop 21 shown in FIG. 10B .
- the field is output as shown in FIG. 10C .
- a key information is recorded with a bit stream so that a VCR having the key information reproduces tape normally, thereby preventing illegal copy of tape.
- the public-key encryption is introduced to disable a pirate to release the copy prevention, increasing reliability of copy prevention.
Abstract
A copy prevention method and apparatus for a digital video system is disclosed including the steps of: (a) adding a header area of a header start code and key field to a reproduced bit stream: (b) decrypting and transmitting the bit stream to which the header area is added: (c) detecting a key field of the decrypted and transmitted bit stream and detecting copy prevention information; and (d) encrypting the bit stream according to information detected from stop (c) and recording it an tape.
Description
This isNotice: More than one reissue applications have been filed for the reissue of U.S. Pat. No. 6,347,144. The reissue applications are application Ser. Nos. 10/737,671 (the present application), 10/737,672 (now RE. 39,319), 11/040,606 (now RE. 41,074), and 11/040,607 which are all reissues of U.S. Pat. No. 6,347,144; 10/981,797, 10/737,672, 10/909,248 and 10/981,798 which are all divisionals of 10/737,672; 12/139,161 which is a continuation of 10/909,248; and 12/405,011 and 12/405,053 which are both divisionals of 10/981,798, U.S. Pat. No. 6,347,144 resulted from application Ser. No. 09/497,465, which is a continuation of application Ser. No. 09/053,288, filed Apr. 1, 1998, now U.S. Pat. No. 6,028,932, which is a continuation of Ser. No. 08/562,042, filed Nov. 22, 1995, now U.S. Pat. No. 5,761,302, issued Jun. 2, 1998.
The present invention relates to a copy prevention technology for a digital video system, and more particularly, to a copy prevention method and apparatus for a digital VCR to which encryption is introduced to display a picture only in a VCR internally containing a corresponding encryption code, thereby preventing tape from being copied.
General copy prevention methods for analog VCR are presented in U.S. Pat. Nos. 4,819,098, 4,571,642 and 4,577,216.
First, U.S. Pat. NO. 4,819,098 discloses a method in which an interference signal is inserted into a video waveform in an automatic gain control circuit (AGC) of a VCR. Here, the inserted signal does not affect the AGC of its monitor but has the AGC of the VCR record an accurate level of signal on a video tape.
In U.S. Pat. No. 4,571,642 4,577,216, there is presented a method in which a phase noise or other corrected signal is inserted into the chrome chroma burst of a video waveform.
However, all the conventional technologies insert a distributing signal to an analog signal using the difference between a circuit of a monitor and a corresponding circuit of a VCR. Some VCRs may perform copy normally despite of copy prevention. Some monitors cannot display images of the original video tape. A conventional copy prevention introduced to an analog VCR system is hard to be applied to digital storage media (DSM).
Specifically, in a satellite receiver or high-definition TV decoder, as shown in FIG. 2 , an MPEG bit stream received by a digital VCR is constructed to transmit a transport header, packetized elementary stream (PEG) (PES) header and audio and video data respectively or simultaneously.
The PES header contains a PES header flag area of 14 bits which is a field for DSM such as digital VCR, and a PES header field having a variable length. The PES header flag area includes 1-bit copyright (CR) flag, 1-bit original-or-copy (OC) flag, 2-bit PD flag, 1-bit TM flag, and 1-bit AC flag.
The PES header field varies in length, and part thereof is set by the PC PD, TM and AC flags. A PTS/DTS area is not present if the value of the PD flag is “00”. It is 40 bits if the value “10”. If the value is “11”, the area is 80 bits. A DSM trick mode field is not present if the TM flag is “0”. If the flag is “1”, the field is 8 bits. An additional copy information field is 8 bits if the AC flag is “1”.
When recording is carried out by the satellite receiver or high-definition TV decoder and compressed video data is encoded in encoder 101, it is converted into a packet form in packet processing portion 122 102 as shown in FIG. 1 . If the compressed audio data is encoded in audio encoder 103, it is converted into a packet form in packet processing portion 104.
When the outputs of packet processing portions 102 and 104 are multiplexed in transmission multiplexer 105, a fixed transmission stream shown in FIG. 2 is output to a digital VCR. In this case, for copy prevention, a public-key encryption is applied which is suggested in U.S. Pat. No. 4,200,770. This solves disadvantages in key management or key distribution when a conventional block-cipher or stream cipher algorithm such as data encryption standard (DES) encrypts or decrypts only with a secret key.
This public-key encryption system has all users U hold unique encryption algorithm EPK U and description algorithm DPK U. Here, encryption algorithm EPK U for the public-key is opened as a public-key to key supply portion 107. Decryption algorithm DPK U for secret key is kept in secret. The characteristics of EPK U and DPK U are as follows.
First, with respect to all users U and message m transmitted, DPK U(EPK U(m))=m.
Second, encryption algorithm EPK U and decryption algorithm DPK U do not require complicated calculation.
Third, it is impossible to find DPK″ U satisfying DPK″ U(EPK U(m))=m from encryption algorithm EPK U.
In the encryption system having the above characteristics, as shown in FIG. 3 , when user A transmits message m to user B, encrypter 106 receiving public-key algorithm EPK U for user B's public-key from key supply portion 107 encrypts message m (EPK U(m))=c) and transmits the result to decrypter 109 via a public channel. Here, the public channel indicates a channel in which transmitted data is not kept in secret.
A concept developed from the public-key encryption is presented in U.S. Pat. No. 4,405,829. This public-key encryption system is called RSA system. A method in which the RSA public-key encryption is efficiently calculated via batch processing is presented in U.S. Pat. No. 4,964,164.
However, this public-key encryption is inappropriate for high-velocity encryption. A CA system is intended to present prevent illegal view viewing. However, there is no method of protecting a program distributed through a digital storage medium, such as a digital VCR.
Therefore, it is an object of the present invention to provide an illegal copy prevention method and apparatus for a digital video system in which, in copy tape, with encrypted key information is transmitted and recorded so that a copied tape is reproducible only in a VCR having a corresponding encrypted key information, thereby prevented copy preventing copy.
To accomplish the object of the present invention, there is provided a copy prevention method for a digital video system comprising the steps of: (a) adding a header area of a header start code and key field to a reproduced bit stream; (b) decrypting and transmitting the bit stream to which the header area is added; (c) detecting a key field of the decrypted and transmitted bit stream and detecting copy prevention information; and (d) encrypting the bit stream according to information detected from step (c) and recording it on tape.
For the object of the present invention, there is provided a copy prevention apparatus for a digital video system comprising: a reproduction block for adding key information to a reproduced bit stream, and decrypting and transmitting it; and a recording block for searching key information of the bit stream transmitted from the reproduction block is to extract copy prevention information, and encrypting and recording the bit stream according to the extracted copy prevention information.
The reproduction block comprises: reproduction means for reproducing data recorded on tape; key insertion means for adding key information to the bit stream of the reproduction means; and decryption means for decrypting the output of the key insertion means and transmitting it to a recording-side VCR.
The recording block comprises: key detecting/correcting means for detecting key information from the transmitted bit stream of a reproducing-side VCR: copy prevention information detecting means for searching the key information detected from the key detecting/correcting means to detect copy prevention information; encrypting means for encrypting the bit stream according to the copy prevention information of the copy prevention information detecting means; and recording means for recording the bit stream encrypted in the encrypting means.
The copy prevention information detecting means comprises: a PES header detecting portion for detecting a PES header from parallel data output from the key detecting/correcting means; and a copy prevention information extractor enabled by a PES header detection signal of the PES header detecting portion to detect an additional copy information field.
Hereinafter, a preferred embodiment of the present invention will be described below with reference to the attached drawings.
Referring to FIG. 5 , a copy prevention apparatus of the present invention comprises a reproducing portion 1 for reproducing data recorded on tape, a key inserting portion 2 for adding a tape header start code and key field at the front end of a bit stream of reproducing portion 1, a decrypting portion 3 for decrypting the output of key inserting portion 2 and transmitting it as parallel data, a key detecting/correcting portion 4 for detecting a key field from the parallel data transmitted from decrypting portion 3, a copy prevention information detecting portion 5 for detecting a PES header from the key field detected and extracting copy prevention information, a copy prevention information correcting portion 6 for correcting the output of copy prevention information detecting portion 5 if necessary, an encrypting portion 7 for encrypting the output of copy prevention information correcting portion 6, and a recording portion 8 for recording the output of encrypting portion 7 on tape.
As shown in FIG. 6 , copy prevention information detecting portion 6 5 comprises a PES header detecting portion 10 for searching the parallel data in synchronization with a clock clk to detect the PES header, and a copy prevention information extractor 20 enabled by the PES header signal of PES header detecting portion 10 to detect the copy prevention information field.
Referring to FIG. 7 , PES header detecting portion 10 comprises first and second flipflops 11 and 12 for sequentially delaying the parallel data according to clock elk clk, a packet start code detector 13 for searching the parallel data and the output of first and second flipflops 11 and 12 to detect the packet start code of the PES header, a stream ID detector 14 for searching the output of second flipflop 12 to detect the stream ID of the PES header, a delay 15 for sequentially delaying the output is-pscp of packet start code detector 13 according to clock clk, and a detection signal generator 16 for logically multiplying the outputs of delay 15 and stream ID detector 14 and outputting a PES header detection signal is-PES-header.
As shown in FIG. 9 , copy prevention information extractor 20 comprises a D-flipflop 21 for holding the parallel data output from PES header detector 10, a D-flipflop 22 for holding PES header detection signal is-PES-header of PES header detector 10, a D-flipflop 23 cleared by the output of D-flipflop 22 and holding voltage (+5V) by a CR signal of the output of D-flipflop 21 and outputting a signal LCR, a D-flipflop 24 cleared by the output of D-flipflop 22 and holding voltage (+5V) by an OC signal of the output of D-flipflop 21 and outputting a signal LOR LOC, a copy prevention information position operator 25 for searching the parallel data of PES header detector 10 and calculating the position of an additional copy information field, a counter 26 for counting the output of copy information position operator 25, and a D-flipflop 27 for holding the additional copy information field of the output of D-flipflop 21.
The operation and effect of the present invention will be explained below. Generally, in case of reproducing or copy recording data on tapa tape, connections between systems are made as shown in FIG. 4 .
With those connections, an MPEG bit stream reproduced from VCR A is input to a satellite receiver or high-definition TV so that it cannot be recognized whether the stream is displayed on a screen or input to VCR B and recorded on another video tape.
For this reason, according to the present invention, in case that the bit stream reproduced from VCR A is copied from VCR B, information on copy prevention is transmitted to VCR B from VCR A. VCR B analyzes this information which is recorded with the bit stream.
Here, the insertion position of the copy prevention information contained in a GA bit stream is very limited because it must not affect decoding of the decoder of the satellite receiver or high-definition TV so that an image is displayed normally on a monitor. The copy prevention information may be inserted into the front end of the MPEG bit stream or inside the PES header.
When the MPEG bit stream is decoded in units or of group of picture (GOP), the respective GOPs are classified by their cop GOP start codes. This is useful in transmitting initialization data to a recording-side VCR because decoding is never affected even when a slight amount of data is added to the front end of the MPEG bit stream.
The case of inserting the copy prevention information into the PES header is useful in repeated transmission of information because copy prevention of a recording medium such as DSM is decided using CR and OC flaps of the PES header and additional copy information field. In this case, there are a variety of copy preventing methods.
First, when a mode of “No Copy” is detected from the additional copy information field of the PES header, VCR B is not able to enter its recording mode.
Second, when a mode of “Copy Permitted” is detected in order to implement a copy prevention such as DAT mode, VCR B records but “No Copy” mode is recorded in the additional copy information field to interrupt recopying from a copying tape. This means that a secondary source tape can be made, but a third source tape cannot.
Third, for “Back-up Copy”, tape B copied from VCR B is reproducible normally only in VCR A. According to this method, reproducing-side VCR A encrypts the bit stream with its own inherent key and records it on tape so that only reproducing-side VCR A decrypts the MPEG bit stream recording on the tape. For every VCR set, a unique key is provided, encrypted by VCR's key and recorded on tape B. However, the VCR set for recording tape B is VCR B and tape B is encrypted by VCR A's key so that VCR A's key needs to be transmitted to VCR B with GA bit stream.
Accordingly, when the key information of VCR A is transmitted as a header in advance prior to the bit stream in the “Back-up Copy”, it is recorded at the front end of tape B, which satisfies the insertion position of the copy prevention information mentioned before.
Here, as shown in FIG. 2 , the position of the additional copy information field is varied within the PES header according to whether presentation time stamp (PTS)/Decoding time stamp (DTS) and DSM trick mode field are present or not. This varied position must be compensated. Here, information transmitted through the additional copy information is a copy prevention method to be performed by recording-side VCR B.
In case of recording the bit stream shown in FIG. 11A in the method of “Back-up Copy”, the format of the bit stream recorded on tape is determined as shown in FIG. 11B .
Here, a header area added to the front of the MPEG bit stream is formed with a tape header start code, that is, the header identifier code, and a key field for storing key information. In case of encrypting the MPEG bit stream in units of GOP, encryption blocks are classified by the packet start code prefix and stream ID of the PES header. The encryption block is a basic unit of encryption and can change whether encryption is performed in units of the encryption block, and encryption algorithm and key selection. Here, the encryption blocks must not be encrypted until the additional copy information field of the PES header. Encryption is performed until the end of the encryption block after the additional copy information field. The first ‘transmission header’ is not encrypted.
The operation of performing the “back-up Copy” mode by adding the header will be described below.
First, in copying, when recording data of tape A is encrypted, reproducing-side VCR A decrypts it using the key information of the key field so as to make message m. Its key information is added to the header and transmitted in the format of FIG. 11C .
Recording-side VCR B records the key information transmitted from reproducing-side VCR A on the header of copying tape B and then records the encrypted bit stream. Here, when the key information is transmitted from reproducing side to recording side, for security, a public-key encryption may be employed to the system because the information may be exposed to a pirate.
Such public-key encryption system ensures the secret of data even though the public-key is exposed but cannot be processed in real-time due to a great amount of calculation. Therefore, this system is not improper when the MPEG bit stream is encrypted directly. The “Back-up Copy” can be implemented when the MPEG bit stream is encrypted using a block-cipher algorithm or stream-cipher algorithm such as DES and a key used is encrypted in the public-key encryption.
In this case, every VCR u incorporates encryption algorithm EPK U corresponding to the public-key and decryption algorithm DPK U corresponding to the secret key. Encryption algorithm EPK U takes a power key of VCR u, and decryption algorithm DPK U an internal key of VCR U.
Here, the internal key may be opened to the public. Reproducing-side VCR A transmits the internal key on the key field of the header because another VCR encrypts using the internal key. Recording-side VCR B randomly selects a key Y used in the block-cipher algorithm such as DES and encrypts it with the public-key encryption system using an external key EPK A. The result is recorded on the key field of copying tape B.
Sequentially, the data is divided into encryption blocks and encrypted and recorded in the block-cipher algorithm using key Y. In this method, the bit stream of FIG. 11D is recorded on copying tape B.
When copying tape B is reproduced in reproducing-side VCR A, key Y can be restored by decryption DPK A[EPK A(Y)] in which data is decrypted properly. In other VCRs, key Y cannot be found, which disables the decryption of the bit stream.
AsAn embodiment of the present invention, shown in FIG. 5 , for performing such an operation will be described below.
When playback starts for tape copying, reproducing portion 1 detects data recorded on tape as shown in FIG. 11A , and amplifies it by a predetermined level. As shown in FIG. 11B , key inserting portion 2 adds a header having a tape header start code and key field to the GA bit stream of reproducing portion 1 shown in FIG. 11A . Copy prevention information is loaded on the additional copy information field of the PES header to form a format shown in FIG. 11C . Here, decrypting portion 3 decrypts the bit stream formed in key inserting portion 2 and transmits it as parallel data to the recording-side VCR via an interface.
When the bit stream of FIG. 11C is transmitted to the recording-side VCR via the interface, key detecting/correcting portion 4 detects the key field added to the bit stream and corrects the key field if necessary.
Copying prevention information detecting portion 5 searches the PES header area to detect the additional copy information field. Here, though a slight amount of information is recorded in the additional copy information field, redundancy is provided in several areas of the bit stream to increase reliability of information transmitted.
Copy prevention information detecting portion 5 extracts the value of AC flag from the PES header flag in order to calculate the position of the additional copy information field because it varies within the PES header. Here, when copy prevention information correcting portion 6 corrects the output of copy prevention information detecting portion 5, encrypting portion 7 performs encryption using the block-cipher algorithm such as DES. Here, copy prevention information correcting portion 6 performs correction while the input data is stored in a RAM. Accordingly, encrypting portion 7 records the encrypted bit stream on tape in recording portion 8. Because the key information of the reproducing-side VCR is added on the copying tape, only a VCR having this key information can reproduce tape normally.
As shown in FIG. 6 , in copy prevention information detecting portion 5, PES header detecting portion 10 searches the output of key detecting/correcting portion 4 and outputs a header detection signal is-PES-header. After header detection signal is-PES-header is input, copy prevention information extractor 20 detects the additional copy information field and OC and CR flags.
Here, packet start code detecting portion 13 searches the bit stream shown in FIG. 8A and the output of first and second flipflops 11 and 12 shown in FIGS. 8B and 8C in order to detect the packet start code of the PES header. When detection signal is-pscp is output as shown in FIG. 8D , delay 15 in which flipflops are coupled at multi-stages delays it sequentially according to clock clk.
Meanwhile, stream ID code detector 14 searches the output of second flipflop 12 and detects the stream ID area of the PES header. Then, detection signal is-sid shown in FIG. 8E is output to detection signal generator 16. Detection signal generator 16 logically multiplies the outputs of delay 15 and stream ID code detector 14, and the flipflops hold the output of the AND gate according to clock clk so that PES header detection signal is-PES-header is output to copy prevention information extractor 20, as shown in FIG. 8P 8F.
Here, copy prevention information extractor 20 for detecting the copy prevention information is formed as shown in FIG. 9 . When the parallel data output from PES header detector 10 and shown in FIG. 10A is held and output as shown in FIG. 10B , D-flipflop 22 synchronized to PES header detection signal is-PES-header of PES header detector 10 shown in FIG. 8F holds voltage +5V so that a HIGH signal is output to the clear ports of D- flipflops 23, 24 and 27 to release the clear states.
D-flipflop 23 is synchronized to the CR flag or the output of D-flipflop 21 shown in FIG. 10B to hold voltage Vcc so that a HIGH signal LCR is output as shown in FIG. 10C . D-flipflop 24 is synchronized to the OC flag of the output of D-flipflop 21 to hold voltage Vcc so that a HIGH signal LOC is output as shown in FIG. 10D .
Copy prevention position detector 25 searches the PD, TM and AC flags of the parallel data of PES header detector 10 shown in FIG. 10A to calculate the position of the additional copy information field, which is output to counter 26 as shown in FIG. 10E . Counter 26 receiving the 4-bit value performs counting so that a HIGH signal is output as shown in FIG. 10F at a predetermined counting value.
D-flipflop 27 synchronized to HIGH output rco of counter 26 holds the additional copy information field from the parallel data of D-flipflop 21 shown in FIG. 10B . The field is output as shown in FIG. 10C .
As described above, in the copy prevention method and apparatus for a digital video system of the present invention, a key information is recorded with a bit stream so that a VCR having the key information reproduces tape normally, thereby preventing illegal copy of tape. In addition, for key information transmission, the public-key encryption is introduced to disable a pirate to release the copy prevention, increasing reliability of copy prevention.
Claims (76)
1. A copy prevention method for a digital video system comprising the steps of:
(a) receiving a digital data stream reproduced from a digital medium;
(b) detecting an encryption key, which is a portion of said received digital data stream;
(c) decrypting said encryption key using key information;
(d) decrypting said received digital data stream based on said decrypted encryption key; and
(e) transmitting said decrypted digital data stream to at least one of a monitor and a digital recorder.
2. A copy prevention method for a digital video system as claimed in claim 1 , wherein said key information is predetermined by said digital video system.
3. A copy prevention method for a digital video system as claimed in claim 1 , wherein said decrypting step (d) is operated in units of predetermined block of said received digital data stream.
4. A copy prevention apparatus for a digital video system comprising:
receiving means for receiving a digital data stream reproduced from a digital medium;
a key detector to detect an encryption key, which is a portion of said received digital data stream;
a decryption unit to decrypt said encryption key using key information and to decrypt said received digital data stream based on said decrypted encryption key; and
a controller to control transmission of said decrypted digital data stream to at least one of a monitor and a digital recorder.
5. A copy prevention apparatus for a digital video system as claimed in claim 4 , wherein said key information is predetermined by said digital video system.
6. A copy prevention apparatus for a digital video system as claimed in claim 4 , wherein said decryption unit is operated in units of predetermined block of said received digital data stream.
7. A copy prevention method for a digital video system comprising the steps of:
(a) receiving a digital data stream reproduced from a digital medium;
(b) detecting an encryption key, which is a portion of said received digital data stream;
(c) decrypting said encryption key using key information;
(d) decrypting said received digital data stream based on said decrypted encryption key.
8. A copy prevention method for a digital video system as claimed in claim 7 , wherein said key information is predetermined by said digital video system.
9. A copy prevention method for a digital video system as claimed in claim 7 , wherein said decrypting step (d) is operated in units of predetermined block of said received digital data stream.
10. A copy prevention apparatus for a digital video system comprising:
receiving means for receiving a digital data stream reproduced from a digital medium;
a key detector to detect an encryption key, which is a portion of said received digital data stream;
a decryption unit to decrypt said encryption key using key information and to decrypt said received digital data stream based on said decrypted encryption key.
11. A copy prevention apparatus for a digital video system as claimed in claim 10 , wherein said key information is predetermined by said digital video system.
12. A copy prevention apparatus for a digital video system as claimed in claim 10 , wherein said decryption unit is operated in units of predetermined block of said received digital data stream.
13. A copy prevention method for a digital video system comprising the steps of:
(a) receiving a digital data stream reproduced from a digital medium;
(b) detecting an encryption key, which is a portion of said received digital data stream;
(c) decrypting said encryption key using predetermined key information;
(d) decrypting said received digital data stream based on said decrypted encryption key.
14. A copy prevention method for a digital video system as claimed in claim 13 , wherein said decrypting step (d) is operated in units of predetermined block of said received digital data stream.
15. A copy prevention apparatus for a digital video system comprising:
receiving means for receiving a digital data stream reproduced from a digital medium;
a key detector to detect an encryption key, which is a portion of said received digital data stream;
a decryption unit to decrypt said encryption key using predetermined key information and to decrypt said received digital data stream based on said decrypted encryption key.
16. A copy prevention apparatus for a digital video system as claimed in claim 15 , wherein said decrypting unit is operated in units of predetermined block of said received digital data stream.
17. A copy prevention method for a digital data system, comprising the steps of:
(a) receiving first key information;
(b) encrypting second key information using said first key information;
(c) encrypting digital data streams using said second key information; and
(d) recording at least said encrypted second key information and said encrypted digital data streams on a digital medium.
18. The method of claim 17 , wherein said (b) randomly selects said second key information.
19. The method of claim 17 , wherein said step (c) encrypts said digital data streams in blocks.
20. A copy prevention apparatus for a digital data system, comprising the steps of:
an encryption unit receiving first key information, encrypting second key information using said first key information, and encrypting digital data streams using said second key information; and
a controller controlling recording of at least said encrypted second key information and said encrypted digital data streams on a digital medium.
21. The apparatus of claim 20 , wherein said encryption unit randomly selects said second key information.
22. The apparatus of claim 20 , wherein said encryption unit encrypts said digital data streams in blocks.
23. A recording medium having a data structure for controlling operation of copy prevention function in a digital data processing device, comprising:
a digital data area storing digital data encrypted using first key information; and
a key information area storing said first key information encrypted using second key information, said first key information operatively controlling the decryption of said encrypted digital data in a digital data process device.
24. A copy prevention method for a digital data system, comprising:
receiving first key information, said first key information for encrypting digital data;
encrypting said first key information using second information; and
transferring said encrypted first key information.
25. The method of claim 24 , wherein said encrypting step public key encrypts said second key information.
26. The method of claim 24 , wherein said transferring step records said encrypted first key information on a digital medium.
27. The method of claim 24 , wherein said transferring step transmits said encrypted first key information.
28. A copy prevention apparatus for a digital data system, comprising:
an encryption unit receiving first key information, said first key information for encrypting digital data, and encrypting said first key information using second key information; and
a controller controlling a transfer of said encrypted first key information.
29. The apparatus of claim 28 , wherein said encryption unit public key encrypts said first key information.
30. The apparatus of claim 28 , wherein said controller controls recording said encrypted first key information on a digital medium.
31. The apparatus of claim 28 , wherein said controller controls transmitting said encrypted first key information.
32. A copy protection method for a copy protection apparatus including a generating device, an encryption device and a recording device, the method comprising:
generating, via the generating device, copy prevention information to control a copy protection operation, the copy prevention information for indicating whether or not copying of digital data is permitted;
generating, via the generating device, identification information to indicate an existence of the copy prevention information;
encrypting, via the encrypting device, the digital data with key information while the copy protection information and the identification information is not encrypted, the key information being required to encrypt the digital data; and
recording, via the recording device, the copy prevention information, the identification information and digital data on a digital recording medium,
wherein the copy prevention information indicates at least one of “copying of digital data is permitted” and “copying of digital data is not permitted” when the identification information indicates that the copy prevention information exists, and
wherein the recording step records the identification information such that the identification information is first read to indicate the existence of the copy prevention information and is not used to control directly the copy protection operation and the copy prevention information is next read to control the copy protection operation.
33. The method of claim 32, further comprising:
dividing the digital data into at least a plurality first data segments, and then recording the digital data based on the data segments.
34. The method of claim 33, wherein the first data segment includes a unit of at least one GOP (Group Of Picture) formed in MPEG data.
35. The method of claim 34, wherein the first data segment is divided into a plurality of second data segments including a header portion and a data portion, respectively.
36. The method of claim 35, wherein the copy prevention information and the identification information are recorded in the header portion of the second data segment.
37. The method of claim 33, further comprising:
adding a header to the first data segment, the header including the identification information and the copy prevention information and the first data segment including at least one GOP (Group Of Picture), and then recording the header and first data segment on the digital recording medium.
38. A copy protection method for a copy protection apparatus including a receiving device, and a recording device, the method comprising:
receiving, via the receiving device, copy prevention information which indicates whether or not copying of digital content is permitted; and
selectively recording, via the recording device, the digital content on a digital recording medium, based on a status of the received copy prevention information,
wherein recording is not performed when the copy prevention information indicates that the copy is not permitted, and recording is performed when the copy prevention information indicates that at least one copy is permitted,
wherein updated copy prevention information and identification information are further recorded on the digital recording medium when recording is performed, the identification information for indicating an existence of the copy prevention information,
wherein the updated copy prevention information indicates at least one of “copying of digital content is permitted” and “copying of digital content is not permitted” when the identification information indicates that the updated copy prevention information exists,
wherein the digital content is encrypted with key information while the copy prevention information and the identification information is not encrypted, and
wherein the identification information is recorded such that the identification information is first read to indicate the existence of the copy prevention information and is not used to control directly the copy protection operation and the copy prevention information is next read to control the copy protection operation.
39. The method of claim 38, wherein the updated copy prevention information indicates that no more copies are permitted.
40. The method of claim 39, wherein the updated copy prevention information and the identification information are written into a header followed by the digital content.
41. The method of claim 38, wherein the digital content is recorded as a data segment including a header portion and a data portion, and the copy prevention information and the identification information are recorded in the header portion of the digital content.
42. The method of claim 38, wherein the copy prevention information and the identification information are recorded in an area followed by the digital content, which is divided into a GOP (Group Of Picture).
43. A copy protection method for a copy protection apparatus including a reproducing device and a controller, the method comprising:
reading, via the reproducing device, control data recorded on a digital recording medium, the control data including an identifier to indicate whether or not copy prevention information exists, wherein the copy prevention information indicates whether digital content recorded on the digital recording medium is to be copied; and
controlling, via the controller, a copy protection function based on the copy prevention information,
wherein the copy prevention information indicates at least one of “copying of digital content is permitted” and “copying of digital content is not permitted” when the identifier indicates that the copy prevention information exists,
wherein the digital content is encrypted with key information while the copy prevention information and the identifier is not encrypted, and
wherein the identifier is recorded such that the identifier is first read to indicate the existence of the copy prevention information and is not used to control directly the copy protection operation and the copy prevention information is next read to control the copy protection operation.
44. The method of claim 43, further comprising:
identifying whether the copy prevention information exists based on the identifier, wherein said controlling step determines whether to perform the copy protection function according to the status of the copy prevention information.
45. A recording medium to be read by a copy protection apparatus, comprising:
copy prevention information indicating whether digital content recorded on the recording medium is to be copied; and
an identifier to identify the existence of the copy prevention information,
wherein the copy prevention information indicates at least one of “copying of digital content is permitted” and “copying of digital content is not permitted” when the identifier indicates that the copy prevention information exists,
wherein the digital content is encrypted with key information while the copy prevention information and the identifier is not encrypted, and
wherein the identifier is recorded such that the identifier is first read to indicate the existence of the copy prevention information and is not used to control directly the copy protection operation and the copy prevention information is next read to control the copy protection operation.
46. The recording medium of claim 45, wherein the digital content is divided into a plurality of first data segments, each first data segment including a plurality of second data segments, each second data segment including a header portion and a data portion, and
wherein the copy prevention information is included in the header portion of at least one of the second data segments.
47. The recording medium of claim 45, wherein the copy prevention information is followed by the digital content.
48. The recording medium of claim 45, wherein the digital content is divided into a plurality of first data segments, each first data segment including a plurality of second data segments, each second data segment including a header portion and a data portion, wherein the first data segment includes at least one GOP (Group Of Picture), wherein the identifier and the copy prevention information are recorded in a position followed by the GOP or are recorded in the header portion of the second data segment.
49. An apparatus for copy protection, comprising:
an extractor device programmed to extract copy prevention information to control a copy protection function, the copy prevention information for indicating whether user data is to be copied; and
a controller programmed to record the user data on a digital recording medium based on the copy prevention information,
wherein the copy prevention information is extracted when identification information indicates an existence of the copy prevention information,
wherein the copy prevention information indicates at least one of “copying of user data is permitted” and “copying of user data is not permitted” when the identification information indicates that the copy prevention information exists,
wherein the user data is encrypted with key information while the copy prevention information and the identification information is not encrypted, and
wherein the identification information is recorded such that the identification information is first read to indicate the existence of the copy prevention information and is not used to control directly the copy protection operation and the copy prevention information is next read to control the copy protection operation.
50. The apparatus of claim 49, wherein the controller is programmed to divide the user data into at least a plurality first data segments, and then to record the user data based on the data segments.
51. The apparatus of claim 49, wherein the controller is programmed to determine whether the copy prevention information exists based on the identification and a status of copy prevention information when the copy prevention information exists, and to control the recording of the user data based on the status of the copy prevention information.
52. The apparatus of claim 51, wherein the controller is programmed to record the user data only when the copy prevention information indicates that the copy is permitted.
53. The method of claim 32, wherein the copy prevention information indicates at least three different copy prevention methods, and the at least three different copy preventing methods includes a no copy method preventing the digital data from being copied, a copy permitted method allowing the digital data to be freely copied, and a backup-copy-only method allowing only a backup copy of the digital data.
54. The method of claim 43, wherein the copy prevention information indicates at least three different copy prevention methods, and the at least three different copying methods includes a no copy method preventing the digital content from being copied, a copy permitted method allowing the digital content to be freely copied, and a backup-copy-only method allowing only a backup copy of the digital content.
55. The recording medium of claim 45, wherein the copy prevention information indicates at least three different copy prevention methods, and the at least three different copying methods includes a no copy method preventing the digital content from being copied, a copy permitted method allowing the digital content to be freely copied, and a backup-copy-only method allowing only a backup copy of the digital content.
56. The apparatus of claim 49, wherein the copy prevention information indicates at least three different copy prevention methods, and the at least three different copying methods includes a no copy method preventing the user data from being copied, a copy permitted method allowing the user data to be freely copied, and a backup-copy-only method allowing only a backup copy of the user data.
57. The method of claim 32, wherein the identification information indicates an address of where the copy prevention information is located.
58. The method of claim 57, wherein the address of the copy prevention information is variable and changes for different digital data.
59. The method of claim 32, wherein a recording apparatus attempting to copy the digital data first reads the identification information to determine if the copy prevention information has been generated, reads the copy prevention information when the identification information indicates the copy prevention information exists, and performs or does not perform a copying of the digital data based on the copy prevention information.
60. The method of claim 32, wherein the copy prevention information further includes information limiting a number of copies that can be made.
61. The method of claim 38, wherein the identification information indicates an address of where the copy prevention information is located.
62. The method of claim 61, wherein the address of the copy prevention information is variable and changes for different digital data.
63. The method of claim 38, wherein a recording apparatus attempting to copy the digital data first reads the identification information to determine if the copy prevention information has been generated, reads the copy prevention information when the identification information indicates the copy prevention information exists, and performs or does not perform a copying of the digital data based on the copy prevention information.
64. The method of claim 38, wherein the copy prevention information further includes information limiting a number of copies that can be made.
65. The method of claim 43, wherein the identification information indicates an address of where the copy prevention information is located.
66. The method of claim 65, wherein the address of the copy prevention information is variable and changes for different digital data.
67. The method of claim 43, wherein a recording apparatus attempting to copy the digital data first reads the identification information to determine if the copy prevention information has been generated, reads the copy prevention information when the identification information indicates the copy prevention information exists, and performs or does not perform a copying of the digital data based on the copy prevention information.
68. The method of claim 43, wherein the copy prevention information further includes information limiting a number of copies that can be made.
69. The recording medium of claim 45, wherein the identification information indicates an address of where the copy prevention information is located.
70. The recording medium of claim 69, wherein the address of the copy prevention information is variable and changes for different digital data.
71. The recording medium of claim 45, wherein a recording apparatus attempting to copy the digital data first reads the identification information to determine if the copy prevention information has been generated, reads the copy prevention information when the identification information indicates the copy prevention information exists, and performs or does not perform a copying of the digital data based on the copy prevention information.
72. The recording medium of claim 45, wherein the copy prevention information further includes information limiting a number of copies that can be made.
73. The apparatus of claim 49, wherein the identification information indicates an address of where the copy prevention information is located.
74. The apparatus of claim 73, wherein the address of the copy prevention information is variable and changes for different digital data.
75. The apparatus of claim 49, wherein a recording apparatus attempting to copy the digital data first reads the identification information to determine if the copy prevention information has been generated, reads the copy prevention information when the identification information indicates the copy prevention information exists, and performs or does not perform a copying of the digital data based on the copy prevention information.
76. The apparatus of claim 49, wherein the copy prevention information further includes information limiting a number of copies that can be made.
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US10/737,672 Expired - Lifetime USRE39319E1 (en) | 1994-11-26 | 2003-12-17 | Copy prevention method and apparatus for digital video system |
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US11/040,607 Expired - Lifetime USRE42922E1 (en) | 1994-11-26 | 2005-01-24 | Copy prevention method and apparatus for digital video system |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050086171A1 (en) * | 2002-07-30 | 2005-04-21 | Makoto Abe | Information processing system, information communication terminal and method, information processing device and method, recording medium, and program |
US20120134529A1 (en) * | 2010-11-28 | 2012-05-31 | Pedro Javier Vazquez | Method and apparatus for applying of a watermark to a video during download |
US20120210447A1 (en) * | 2010-11-28 | 2012-08-16 | Pedro Javier Vazquez | Secure video download method |
US20130202110A1 (en) * | 2012-02-08 | 2013-08-08 | Vixs Systems, Inc. | Container agnostic decryption device and methods for use therewith |
Families Citing this family (147)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10361802B1 (en) | 1999-02-01 | 2019-07-23 | Blanding Hovenweep, Llc | Adaptive pattern recognition based control system and method |
KR0152788B1 (en) | 1994-11-26 | 1998-10-15 | 이헌조 | Copy protecting method and apparatus of digital image system |
KR0136458B1 (en) | 1994-12-08 | 1998-05-15 | 구자홍 | Copy protection apparatus of digital magnetic recording and reproducing system |
US6516064B1 (en) * | 1995-07-25 | 2003-02-04 | Sony Corporation | Signal recording apparatus, signal record medium and signal reproducing apparatus |
JP3467964B2 (en) * | 1995-08-10 | 2003-11-17 | ソニー株式会社 | Data recording device and method, data reproducing device and method, recording medium, and data transmission method |
US5703859A (en) * | 1995-09-01 | 1997-12-30 | Sony Corporation | Digital video copy protection system |
KR0166923B1 (en) * | 1995-09-18 | 1999-03-20 | 구자홍 | Method and apparatus of preventing an illegal watching and copying in a digital broadcasting system |
JP3941178B2 (en) | 1996-09-05 | 2007-07-04 | ソニー株式会社 | Recording medium, digital recording device, and control IC |
US7221853B1 (en) | 1996-09-05 | 2007-05-22 | Sony Corporation | Digital recording apparatus and copyright protection method thereof |
MY121267A (en) * | 1996-09-05 | 2006-01-28 | Sony Corp | Digital recording apparatus and copyright protection method thereof |
JPH10108148A (en) * | 1996-09-27 | 1998-04-24 | Sony Corp | Method for protecting copyright of digital data and protection system |
US6584275B1 (en) | 1996-12-20 | 2003-06-24 | Thomson Licensing Sa | Control of consumer recording equipment |
GB9626574D0 (en) * | 1996-12-20 | 1997-02-05 | Thomson Consumer Electronics | Control of consumer recording equipment |
JP4110588B2 (en) * | 1997-03-19 | 2008-07-02 | ソニー株式会社 | Data receiving apparatus and receiving method |
JP3891230B2 (en) * | 1997-05-29 | 2007-03-14 | ソニー株式会社 | Additional information superimposing apparatus and additional information superimposing method |
JPH1173725A (en) * | 1997-08-29 | 1999-03-16 | Sony Corp | Information signal recording/reproducing system, information recording device, information signal reproducing device and information signal recording/ reproducing method |
US6223285B1 (en) * | 1997-10-24 | 2001-04-24 | Sony Corporation Of Japan | Method and system for transferring information using an encryption mode indicator |
KR100281044B1 (en) * | 1997-12-30 | 2001-02-01 | 구자홍 | Method and Device of copy protect for Digital VCR |
US7778418B1 (en) | 1998-01-08 | 2010-08-17 | Samsung Electronics Co., Ltd. | System and method for copy protection for digital signals |
US8300832B2 (en) | 1998-01-08 | 2012-10-30 | Samsung Electronics Co., Ltd. | System and method for copy protection for digital signals |
JP3890737B2 (en) * | 1998-04-14 | 2007-03-07 | 株式会社日立製作所 | Apparatus and method for reproducing digital video signal or audio signal |
US6345099B1 (en) * | 1998-05-22 | 2002-02-05 | S3 Incorporated | System and method for copy protecting computer graphics |
JP3835655B2 (en) * | 1998-06-09 | 2006-10-18 | ソニー株式会社 | Information signal reproducing apparatus, information signal processing apparatus, information signal reproducing method and information signal output method |
CN100359583C (en) | 1998-11-02 | 2008-01-02 | 松下电器产业株式会社 | Recording/reproducing apparatus, program recorded medium, recorded medium, cache device and transmitter |
DE19906449C1 (en) * | 1999-02-16 | 2000-08-10 | Fraunhofer Ges Forschung | Multimedia data stream encryption method provides first section of useful data block which is not encrypted for providing preview or prelist function |
DE19906432C1 (en) * | 1999-02-16 | 2000-06-21 | Fraunhofer Ges Forschung | Second data stream generation method from first stream including start and functional audiovisual, data blocks, involves insertion of origination information |
MY131509A (en) * | 1999-03-15 | 2007-08-30 | Sony Corp | Data processing method, apparatus and system for encrypted- data transfer |
KR100700508B1 (en) * | 1999-03-18 | 2007-03-28 | 엘지전자 주식회사 | Copyright protection apparatus for multimedia transmission system |
US6697489B1 (en) * | 1999-03-30 | 2004-02-24 | Sony Corporation | Method and apparatus for securing control words |
US7730300B2 (en) * | 1999-03-30 | 2010-06-01 | Sony Corporation | Method and apparatus for protecting the transfer of data |
US6912513B1 (en) | 1999-10-29 | 2005-06-28 | Sony Corporation | Copy-protecting management using a user scrambling key |
US7039614B1 (en) * | 1999-11-09 | 2006-05-02 | Sony Corporation | Method for simulcrypting scrambled data to a plurality of conditional access devices |
US7010685B1 (en) | 1999-11-09 | 2006-03-07 | Sony Corporation | Method and apparatus for storing scrambled digital programs by filtering product identifier |
JP3740917B2 (en) * | 1999-11-26 | 2006-02-01 | 日本ビクター株式会社 | Recording method and recording medium |
US6701528B1 (en) * | 2000-01-26 | 2004-03-02 | Hughes Electronics Corporation | Virtual video on demand using multiple encrypted video segments |
SG97852A1 (en) * | 2000-02-25 | 2003-08-20 | Kent Ridge Digital Labs | Method and apparatus for digital content copy protection |
JP2001266480A (en) * | 2000-03-22 | 2001-09-28 | Sony Computer Entertainment Inc | Recording medium with recorded enciphered audio data and information processor |
JP4457474B2 (en) | 2000-04-04 | 2010-04-28 | ソニー株式会社 | Information recording apparatus, information reproducing apparatus, information recording method, information reproducing method, information recording medium, and program providing medium |
JP3896768B2 (en) * | 2000-05-31 | 2007-03-22 | 日本電気株式会社 | MPEG video elementary stream extraction apparatus and elementary stream extraction method used therefor |
US8082572B1 (en) | 2000-06-08 | 2011-12-20 | The Directv Group, Inc. | Method and apparatus for transmitting, receiving, and utilizing audio/visual signals and other information |
US20040205812A1 (en) * | 2000-06-22 | 2004-10-14 | Candelore Brant L. | Method and apparatus for routing program data in a program viewing unit |
US20030206631A1 (en) * | 2000-06-22 | 2003-11-06 | Candelore Brant L. | Method and apparatus for scrambling program data for furture viewing |
US7203314B1 (en) | 2000-07-21 | 2007-04-10 | The Directv Group, Inc. | Super encrypted storage and retrieval of media programs with modified conditional access functionality |
US6853728B1 (en) * | 2000-07-21 | 2005-02-08 | The Directv Group, Inc. | Video on demand pay per view services with unmodified conditional access functionality |
US7457414B1 (en) * | 2000-07-21 | 2008-11-25 | The Directv Group, Inc. | Super encrypted storage and retrieval of media programs with smartcard generated keys |
US7203311B1 (en) | 2000-07-21 | 2007-04-10 | The Directv Group, Inc. | Super encrypted storage and retrieval of media programs in a hard-paired receiver and storage device |
US8140859B1 (en) | 2000-07-21 | 2012-03-20 | The Directv Group, Inc. | Secure storage and replay of media programs using a hard-paired receiver and storage device |
US7242772B1 (en) | 2000-09-07 | 2007-07-10 | Eastman Kodak Company | Encryption apparatus and method for synchronizing multiple encryption keys with a data stream |
JP2002133765A (en) * | 2000-10-20 | 2002-05-10 | Pioneer Electronic Corp | Information recording device, information recording method, information reproducing device, information reproducing method, and information storage medium |
KR100386238B1 (en) * | 2001-01-19 | 2003-06-02 | 엘지전자 주식회사 | Digital audio copy preventing apparatus and method |
US7181017B1 (en) | 2001-03-23 | 2007-02-20 | David Felsher | System and method for secure three-party communications |
US7350082B2 (en) * | 2001-06-06 | 2008-03-25 | Sony Corporation | Upgrading of encryption |
US7747853B2 (en) | 2001-06-06 | 2010-06-29 | Sony Corporation | IP delivery of secure digital content |
US7895616B2 (en) * | 2001-06-06 | 2011-02-22 | Sony Corporation | Reconstitution of program streams split across multiple packet identifiers |
US7124303B2 (en) * | 2001-06-06 | 2006-10-17 | Sony Corporation | Elementary stream partial encryption |
KR100408287B1 (en) * | 2001-06-15 | 2003-12-03 | 삼성전자주식회사 | A system and method for protecting content |
US7039955B2 (en) | 2001-09-14 | 2006-05-02 | The Directv Group, Inc. | Embedded blacklisting for digital broadcast system security |
JP4659357B2 (en) * | 2001-09-21 | 2011-03-30 | ザ・ディレクティービー・グループ・インコーポレイテッド | Method and apparatus for controlling paired operation of conditional access module and integrated receiver and decoder |
US7409562B2 (en) * | 2001-09-21 | 2008-08-05 | The Directv Group, Inc. | Method and apparatus for encrypting media programs for later purchase and viewing |
US20030088773A1 (en) * | 2001-11-07 | 2003-05-08 | Koninklijke Philips Electronics N. V. | Method of and apparatus for preventing illicit copying of digital content |
US7823174B2 (en) * | 2002-01-02 | 2010-10-26 | Sony Corporation | Macro-block based content replacement by PID mapping |
US7039938B2 (en) * | 2002-01-02 | 2006-05-02 | Sony Corporation | Selective encryption for video on demand |
US7376233B2 (en) * | 2002-01-02 | 2008-05-20 | Sony Corporation | Video slice and active region based multiple partial encryption |
US7242773B2 (en) * | 2002-09-09 | 2007-07-10 | Sony Corporation | Multiple partial encryption using retuning |
US7765567B2 (en) * | 2002-01-02 | 2010-07-27 | Sony Corporation | Content replacement by PID mapping |
US7215770B2 (en) * | 2002-01-02 | 2007-05-08 | Sony Corporation | System and method for partially encrypted multimedia stream |
US7218738B2 (en) * | 2002-01-02 | 2007-05-15 | Sony Corporation | Encryption and content control in a digital broadcast system |
US7233669B2 (en) * | 2002-01-02 | 2007-06-19 | Sony Corporation | Selective encryption to enable multiple decryption keys |
US7155012B2 (en) * | 2002-01-02 | 2006-12-26 | Sony Corporation | Slice mask and moat pattern partial encryption |
US7302059B2 (en) * | 2002-01-02 | 2007-11-27 | Sony Corporation | Star pattern partial encryption |
WO2003071799A2 (en) * | 2002-02-22 | 2003-08-28 | Nds Limited | Scrambled packet stream processing |
US7167574B2 (en) * | 2002-03-14 | 2007-01-23 | Seiko Epson Corporation | Method and apparatus for content-based image copy detection |
JP3769236B2 (en) * | 2002-03-15 | 2006-04-19 | 株式会社東芝 | Digital information recording / playback system |
US6873905B2 (en) * | 2002-03-19 | 2005-03-29 | Opnext Japan, Inc. | Communications type navigation device |
US20090180025A1 (en) * | 2002-05-28 | 2009-07-16 | Sony Corporation | Method and apparatus for overlaying graphics on video |
US7530084B2 (en) * | 2002-05-28 | 2009-05-05 | Sony Corporation | Method and apparatus for synchronizing dynamic graphics |
US8818896B2 (en) * | 2002-09-09 | 2014-08-26 | Sony Corporation | Selective encryption with coverage encryption |
US7398008B2 (en) * | 2002-09-19 | 2008-07-08 | Hewlett-Packard Development Company, L.P. | Copy protection for analog video signals from computing devices |
US8572408B2 (en) * | 2002-11-05 | 2013-10-29 | Sony Corporation | Digital rights management of a digital device |
US7724907B2 (en) * | 2002-11-05 | 2010-05-25 | Sony Corporation | Mechanism for protecting the transfer of digital content |
CN100377684C (en) * | 2002-11-15 | 2008-04-02 | 乐金电子(天津)电器有限公司 | Steam jet dust collector |
US7000241B2 (en) * | 2002-11-21 | 2006-02-14 | The Directv Group, Inc. | Method and apparatus for minimizing conditional access information overhead while ensuring conditional access information reception in multi-tuner receivers |
US7225458B2 (en) * | 2002-11-21 | 2007-05-29 | The Directv Group, Inc. | Method and apparatus for ensuring reception of conditional access information in multi-tuner receivers |
US8667525B2 (en) * | 2002-12-13 | 2014-03-04 | Sony Corporation | Targeted advertisement selection from a digital stream |
US8645988B2 (en) * | 2002-12-13 | 2014-02-04 | Sony Corporation | Content personalization for digital content |
US9818136B1 (en) | 2003-02-05 | 2017-11-14 | Steven M. Hoffberg | System and method for determining contingent relevance |
US20040165586A1 (en) * | 2003-02-24 | 2004-08-26 | Read Christopher Jensen | PID filters based network routing |
US7409702B2 (en) * | 2003-03-20 | 2008-08-05 | Sony Corporation | Auxiliary program association table |
KR100974448B1 (en) * | 2003-04-24 | 2010-08-10 | 엘지전자 주식회사 | Method for managing a copy protection information of optical disc |
KR20040092649A (en) * | 2003-04-24 | 2004-11-04 | 엘지전자 주식회사 | Method for managing a copy protection information of optical disc |
KR100974449B1 (en) * | 2003-04-24 | 2010-08-10 | 엘지전자 주식회사 | Method for managing a copy protection information of optical disc |
KR100972831B1 (en) * | 2003-04-24 | 2010-07-28 | 엘지전자 주식회사 | Protectiog method of encrypted data and reprodecing apparatus therof |
US7532804B2 (en) * | 2003-06-23 | 2009-05-12 | Seiko Epson Corporation | Method and apparatus for video copy detection |
JP4710607B2 (en) * | 2003-07-14 | 2011-06-29 | ソニー株式会社 | Encryption device, encryption method and encryption program, decryption device, decryption method and decryption program, and recording medium |
FR2857813A1 (en) * | 2003-07-16 | 2005-01-21 | St Microelectronics Sa | Timing mark inserting method for e.g. video and audio data flow, involves inserting timing mark in compressed data flow only after number of encrypted bits has reached/exceeded number of bits of encryption block |
US20050036067A1 (en) * | 2003-08-05 | 2005-02-17 | Ryal Kim Annon | Variable perspective view of video images |
US20050066357A1 (en) * | 2003-09-22 | 2005-03-24 | Ryal Kim Annon | Modifying content rating |
US7552334B2 (en) * | 2003-09-24 | 2009-06-23 | The Boeing Company | System and method for presentation integrity |
JP4336957B2 (en) * | 2003-09-30 | 2009-09-30 | 日本電気株式会社 | Transport stream encryption apparatus, editing apparatus, and methods thereof |
US20050097597A1 (en) * | 2003-10-31 | 2005-05-05 | Pedlow Leo M.Jr. | Hybrid storage of video on demand content |
US20050097596A1 (en) * | 2003-10-31 | 2005-05-05 | Pedlow Leo M.Jr. | Re-encrypted delivery of video-on-demand content |
US7263187B2 (en) * | 2003-10-31 | 2007-08-28 | Sony Corporation | Batch mode session-based encryption of video on demand content |
US7620180B2 (en) * | 2003-11-03 | 2009-11-17 | Sony Corporation | Preparation of content for multiple conditional access methods in video on demand |
US7853980B2 (en) * | 2003-10-31 | 2010-12-14 | Sony Corporation | Bi-directional indices for trick mode video-on-demand |
US7346163B2 (en) * | 2003-10-31 | 2008-03-18 | Sony Corporation | Dynamic composition of pre-encrypted video on demand content |
US7343013B2 (en) * | 2003-12-16 | 2008-03-11 | Sony Corporation | Composite session-based encryption of video on demand content |
US20050102702A1 (en) * | 2003-11-12 | 2005-05-12 | Candelore Brant L. | Cablecard with content manipulation |
CN1879343A (en) * | 2003-11-14 | 2006-12-13 | 松下电器产业株式会社 | Data processing device |
US7580523B2 (en) * | 2004-01-16 | 2009-08-25 | The Directv Group, Inc. | Distribution of video content using client to host pairing of integrated receivers/decoders |
US7599494B2 (en) * | 2004-01-16 | 2009-10-06 | The Directv Group, Inc. | Distribution of video content using a trusted network key for sharing content |
US7548624B2 (en) * | 2004-01-16 | 2009-06-16 | The Directv Group, Inc. | Distribution of broadcast content for remote decryption and viewing |
US20050169473A1 (en) * | 2004-02-03 | 2005-08-04 | Candelore Brant L. | Multiple selective encryption with DRM |
US7801303B2 (en) | 2004-03-01 | 2010-09-21 | The Directv Group, Inc. | Video on demand in a broadcast network |
US7590243B2 (en) * | 2004-05-04 | 2009-09-15 | The Directv Group, Inc. | Digital media conditional access system for handling digital media content |
US7543317B2 (en) * | 2004-08-17 | 2009-06-02 | The Directv Group, Inc. | Service activation of set-top box functionality using broadcast conditional access system |
US7895617B2 (en) * | 2004-12-15 | 2011-02-22 | Sony Corporation | Content substitution editor |
US8041190B2 (en) | 2004-12-15 | 2011-10-18 | Sony Corporation | System and method for the creation, synchronization and delivery of alternate content |
US7486827B2 (en) * | 2005-01-21 | 2009-02-03 | Seiko Epson Corporation | Efficient and robust algorithm for video sequence matching |
JP4706278B2 (en) * | 2005-02-24 | 2011-06-22 | ソニー株式会社 | Information processing system, playback terminal device and playback method, information processing device and method, and program |
WO2006113281A2 (en) * | 2005-04-13 | 2006-10-26 | Store Eyes, Inc. | System and method for measuring display compliance |
US7840489B2 (en) * | 2005-07-01 | 2010-11-23 | Sony Corporation | Key sharing for DRM interoperability |
US9325944B2 (en) | 2005-08-11 | 2016-04-26 | The Directv Group, Inc. | Secure delivery of program content via a removable storage medium |
US8874477B2 (en) | 2005-10-04 | 2014-10-28 | Steven Mark Hoffberg | Multifactorial optimization system and method |
US8185921B2 (en) | 2006-02-28 | 2012-05-22 | Sony Corporation | Parental control of displayed content using closed captioning |
US7555464B2 (en) * | 2006-03-01 | 2009-06-30 | Sony Corporation | Multiple DRM management |
US8001565B2 (en) | 2006-05-15 | 2011-08-16 | The Directv Group, Inc. | Methods and apparatus to conditionally authorize content delivery at receivers in pay delivery systems |
US8775319B2 (en) | 2006-05-15 | 2014-07-08 | The Directv Group, Inc. | Secure content transfer systems and methods to operate the same |
US7992175B2 (en) | 2006-05-15 | 2011-08-02 | The Directv Group, Inc. | Methods and apparatus to provide content on demand in content broadcast systems |
US8275132B2 (en) | 2006-05-15 | 2012-09-25 | Buchen Neil B | System and method for dynamically allocating stream identifiers in a multi-encryption transport system |
US8095466B2 (en) | 2006-05-15 | 2012-01-10 | The Directv Group, Inc. | Methods and apparatus to conditionally authorize content delivery at content servers in pay delivery systems |
US8996421B2 (en) | 2006-05-15 | 2015-03-31 | The Directv Group, Inc. | Methods and apparatus to conditionally authorize content delivery at broadcast headends in pay delivery systems |
US9225761B2 (en) | 2006-08-04 | 2015-12-29 | The Directv Group, Inc. | Distributed media-aggregation systems and methods to operate the same |
US9178693B2 (en) | 2006-08-04 | 2015-11-03 | The Directv Group, Inc. | Distributed media-protection systems and methods to operate the same |
CN101014129B (en) * | 2007-03-06 | 2010-12-15 | 孟智平 | Video data compression method |
US7917747B2 (en) * | 2007-03-22 | 2011-03-29 | Igt | Multi-party encryption systems and methods |
US8175916B2 (en) * | 2007-03-30 | 2012-05-08 | Sharp Kabushiki Kaisha | Image forming system and image forming apparatus |
JP4876082B2 (en) * | 2008-01-28 | 2012-02-15 | 株式会社日立製作所 | Recording apparatus and recording method |
US9535994B1 (en) | 2010-03-26 | 2017-01-03 | Jonathan Grier | Method and system for forensic investigation of data access |
US8997172B2 (en) * | 2010-11-08 | 2015-03-31 | Citrix Systems, Inc. | Controlling information disclosure during application streaming and publishing |
CN103313640A (en) * | 2010-12-01 | 2013-09-18 | 创科地板护理技术有限公司 | Wheel assembly for a vacuum cleaner |
JP2012016053A (en) * | 2011-09-02 | 2012-01-19 | Hitachi Consumer Electronics Co Ltd | Digital signal processing device |
WO2016022979A1 (en) | 2014-08-07 | 2016-02-11 | Sonic IP. Inc. | Systems and methods for protecting elementary bitstreams incorporating independently encoded tiles |
CN105576589B (en) * | 2014-10-14 | 2018-02-02 | 北京星光影视设备科技股份有限公司 | Servo-actuated folding and unfolding cable coiling device damping unit |
JP2018011645A (en) * | 2016-07-19 | 2018-01-25 | 日立アプライアンス株式会社 | Vacuum cleaner |
CN108652512A (en) * | 2018-04-28 | 2018-10-16 | 深圳龙图腾创新设计有限公司 | A kind of domestic type glass outer surface cleaning device |
CN111685644B (en) * | 2020-06-23 | 2021-06-29 | 泰州鸿材科技有限公司 | Dust collector with automatic wire winding and unwinding functions and using method thereof |
CN113511564A (en) * | 2020-08-27 | 2021-10-19 | 苏州市春菊电器有限公司 | Winder structure of line is received to a key |
Citations (98)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3753228A (en) | 1971-12-29 | 1973-08-14 | Westinghouse Air Brake Co | Synchronizing arrangement for digital data transmission systems |
US4420829A (en) | 1981-01-08 | 1983-12-13 | Carlson John E | Holographic system for the storage of audio, video and computer data |
US4554461A (en) | 1982-12-24 | 1985-11-19 | Hitachi, Ltd. | Information transmitting apparatus |
US4694489A (en) | 1983-12-22 | 1987-09-15 | Frederiksen Jeffrey E | Video transmission system |
US4736422A (en) | 1983-06-30 | 1988-04-05 | Independent Broadcasting Authority | Encrypted broadcast television system |
EP0267039A2 (en) | 1986-11-05 | 1988-05-11 | Satellite Technology Services, Inc. | Video system and method for controlled videotaping |
US4796220A (en) | 1986-12-15 | 1989-01-03 | Pride Software Development Corp. | Method of controlling the copying of software |
US4802215A (en) | 1983-07-22 | 1989-01-31 | Independent Broadcasting Authority | Security system for television signal encryption |
US4817140A (en) | 1986-11-05 | 1989-03-28 | International Business Machines Corp. | Software protection system using a single-key cryptosystem, a hardware-based authorization system and a secure coprocessor |
US4871140A (en) | 1988-05-20 | 1989-10-03 | Moore Push-Pin Company | Hanging device |
US4890319A (en) | 1984-09-21 | 1989-12-26 | Scientific-Atlantic, Inc. | Method for controlling copying of protected information transmitted over a communications link |
USRE33189E (en) | 1981-11-19 | 1990-03-27 | Communications Satellite Corporation | Security system for SSTV encryption |
US4916738A (en) | 1986-11-05 | 1990-04-10 | International Business Machines Corp. | Remote access terminal security |
US4924513A (en) | 1987-09-25 | 1990-05-08 | Digital Equipment Corporation | Apparatus and method for secure transmission of data over an unsecure transmission channel |
US4937679A (en) | 1986-08-11 | 1990-06-26 | Macrovision | Dual deck video recording apparatus having enhanced copy protection and method for providing enhanced copy protection to such a recording apparatus |
US4965680A (en) | 1987-06-30 | 1990-10-23 | Kabushiki Kaisha Toshiba | Apparatus for releasing a restriction on the recording of an information signal on a recording medium |
US4975952A (en) | 1985-09-04 | 1990-12-04 | U. S. Philips Corporation | Method of data communication |
US4999806A (en) | 1987-09-04 | 1991-03-12 | Fred Chernow | Software distribution system |
US5003590A (en) * | 1989-12-18 | 1991-03-26 | Eidak Corporation | Encoding an optical video disc to inhibit video tape recording |
US5014274A (en) | 1988-04-08 | 1991-05-07 | Victor Company Of Japan, Ltd. | Code-error correcting device |
US5034981A (en) * | 1988-04-11 | 1991-07-23 | Eidak Corporation | Anti-copying video signal processing |
US5034985A (en) | 1989-11-13 | 1991-07-23 | Pitney Bowes Inc. | Matched mailing system employing address print array recognition |
US5054064A (en) | 1990-03-29 | 1991-10-01 | Gte Laboratories Incorporated | Video control system for recorded programs |
US5058162A (en) | 1990-08-09 | 1991-10-15 | Hewlett-Packard Company | Method of distributing computer data files |
US5057947A (en) | 1988-02-10 | 1991-10-15 | Matsushita Electric Industrial Co., Ltd. | Recording and reproducing apparatus with limited digital copying |
US5073925A (en) * | 1987-07-08 | 1991-12-17 | Matsushita Electric Industrial Co., Ltd. | Method and apparatus for the protection of signal copy |
US5109413A (en) | 1986-11-05 | 1992-04-28 | International Business Machines Corporation | Manipulating rights-to-execute in connection with a software copy protection mechanism |
US5134656A (en) | 1989-02-22 | 1992-07-28 | Kudelski S.A. Fabrique D'enregistruers Nagra | Pre-payment television system using a memory card associated with a decoder |
US5138659A (en) | 1991-05-02 | 1992-08-11 | General Instrument Corporation | Conversion of television signal formats with retention of common control data stream |
EP0498617A2 (en) | 1991-02-07 | 1992-08-12 | Matsushita Electric Industrial Co., Ltd. | Digital signal transmitting method |
US5144658A (en) | 1989-11-24 | 1992-09-01 | Sharp Kabushiki Kaisha | Repeater of digital audio interface signal |
US5159633A (en) | 1990-01-19 | 1992-10-27 | Canon Kabushiki Kaisha | Multimedia network system |
EP0519320A2 (en) | 1991-06-18 | 1992-12-23 | Matsushita Electric Industrial Co., Ltd. | Video theater system and copy preventive method |
US5182680A (en) | 1990-02-26 | 1993-01-26 | Sony Corporation | Recording control system |
US5193176A (en) | 1990-10-17 | 1993-03-09 | Powercard Supply C.A. | Computer work saving during power interruption |
US5215448A (en) * | 1991-12-26 | 1993-06-01 | Ingersoll-Dresser Pump Company | Combined boiler feed and condensate pump |
US5231546A (en) | 1988-02-10 | 1993-07-27 | Matsushita Electric Industrial Co., Ltd. | Recording and reproducing apparatus with limited digital copying |
US5233650A (en) | 1989-03-03 | 1993-08-03 | Sun Plan Investments Limited | Telephone support device |
US5243650A (en) | 1990-03-23 | 1993-09-07 | Televerket | Method and apparatus for encryption/decryption of digital multisound in television |
US5260999A (en) | 1991-06-28 | 1993-11-09 | Digital Equipment Corporation | Filters in license management system |
US5265164A (en) | 1991-10-31 | 1993-11-23 | International Business Machines Corporation | Cryptographic facility environment backup/restore and replication in a public key cryptosystem |
EP0580367A2 (en) | 1992-07-24 | 1994-01-26 | Sony Corporation | Video signal transmission, recording and reproduction |
EP0581227A2 (en) | 1992-07-28 | 1994-02-02 | Hitachi, Ltd. | Apparatus for the recording and/or the reproducing of video signals |
US5289276A (en) | 1992-06-19 | 1994-02-22 | General Electric Company | Method and apparatus for conveying compressed video data over a noisy communication channel |
JPH0670282A (en) | 1992-06-16 | 1994-03-11 | Matsushita Electric Ind Co Ltd | Video signal recording and reproducing device |
EP0589459A1 (en) | 1992-09-24 | 1994-03-30 | Matsushita Electric Industrial Co., Ltd. | Recording and reproducing apparatus |
US5315448A (en) | 1993-03-18 | 1994-05-24 | Macrovision Corporation | Copy protection for hybrid digital video tape recording and unprotected source material |
JPH06162690A (en) | 1992-11-20 | 1994-06-10 | Sony Corp | Transmitter |
JPH06199288A (en) | 1993-01-07 | 1994-07-19 | Permelec Electrode Ltd | Propulsion device in liquid |
JPH06339110A (en) | 1993-04-02 | 1994-12-06 | Sony Corp | Picture information transmission system, picture information recorded and picture information reproduction device |
US5377266A (en) | 1992-07-21 | 1994-12-27 | Matsushita Electric Industrial Co., Ltd. | Scramble apparatus and descramble apparatus |
US5381481A (en) | 1993-08-04 | 1995-01-10 | Scientific-Atlanta, Inc. | Method and apparatus for uniquely encrypting a plurality of services at a transmission site |
US5392351A (en) | 1992-03-16 | 1995-02-21 | Fujitsu Limited | Electronic data protection system |
US5406625A (en) | 1991-11-22 | 1995-04-11 | Sony Corporation | Receiving apparatus and recording method |
US5442541A (en) | 1993-07-23 | 1995-08-15 | Xerox Corporation | Enabling features over common communication channel |
US5469272A (en) | 1991-03-05 | 1995-11-21 | Sony Corporation | Digital signal recording and/or reproducing apparatus |
US5477276A (en) | 1992-12-17 | 1995-12-19 | Sony Corporation | Digital signal processing apparatus for achieving fade-in and fade-out effects on digital video signals |
US5504816A (en) | 1994-02-02 | 1996-04-02 | Gi Corporation | Method and apparatus for controlling access to digital signals |
US5506903A (en) | 1993-04-06 | 1996-04-09 | Sony Corporation | Digital multiplex transmission system |
US5513260A (en) | 1994-06-29 | 1996-04-30 | Macrovision Corporation | Method and apparatus for copy protection for various recording media |
US5530756A (en) | 1993-09-15 | 1996-06-25 | U.S. Philips Corporation | Television scrambling and descrambling method, and transmitter and receiver using said method |
US5546461A (en) | 1993-04-09 | 1996-08-13 | Matsushita Electric Industrial Co., Ltd. | Scramble system for use in digital video signal recording and reproducing system or transmission and receiving system, comprising scramble apparatus and descramble apparatus |
US5563946A (en) | 1994-04-25 | 1996-10-08 | International Business Machines Corporation | Method and apparatus for enabling trial period use of software products: method and apparatus for passing encrypted files between data processing systems |
US5574787A (en) | 1994-07-25 | 1996-11-12 | Ryan; John O. | Apparatus and method for comprehensive copy protection for video platforms and unprotected source material |
US5576843A (en) | 1993-10-29 | 1996-11-19 | Time Warner Entertainment Co., L.P. | System and method for controlling play of multiple dialog audio tracks of a software carrier |
US5579120A (en) | 1993-10-08 | 1996-11-26 | Sony Corporation | Copyright protection for digital signal recording and/or reproduction and recording medium thereof |
US5588058A (en) | 1993-03-31 | 1996-12-24 | U.S. Philips Corporation | Method and device for scrambling and descrambling of a specific television broadcast |
US5590306A (en) | 1992-09-08 | 1996-12-31 | Fuji Photo Film Co., Ltd. | Memory card management system for writing data with usage and recording codes made significant |
US5629980A (en) | 1994-11-23 | 1997-05-13 | Xerox Corporation | System for controlling the distribution and use of digital works |
US5638513A (en) | 1993-12-22 | 1997-06-10 | Ananda; Mohan | Secure software rental system using continuous asynchronous password verification |
US5646992A (en) | 1993-09-23 | 1997-07-08 | Digital Delivery, Inc. | Assembly, distribution, and use of digital information |
US5659613A (en) | 1994-06-29 | 1997-08-19 | Macrovision Corporation | Method and apparatus for copy protection for various recording media using a video finger print |
US5673357A (en) | 1994-02-15 | 1997-09-30 | Sony Corporation | Video recording, transmitting and reproducing apparatus with concurrent recording and transmitting or multiple dubbing of copy protected video signals |
US5689559A (en) | 1994-12-08 | 1997-11-18 | Lg Electronics Inc. | Copy prevention method and apparatus of a digital magnetic recording/reproducing system |
US5689561A (en) | 1995-10-06 | 1997-11-18 | Pace; Michael | Computer-based trading card system and method |
US5703859A (en) | 1995-09-01 | 1997-12-30 | Sony Corporation | Digital video copy protection system |
US5715403A (en) | 1994-11-23 | 1998-02-03 | Xerox Corporation | System for controlling the distribution and use of digital works having attached usage rights where the usage rights are defined by a usage rights grammar |
US5757910A (en) | 1993-04-06 | 1998-05-26 | Goldstar Co., Ltd. | Apparatus for preventing illegal copying of a digital broadcasting signal |
US5757909A (en) | 1994-11-26 | 1998-05-26 | Lg Electronics, Inc. | Illegal view and copy protection method in digital video system and controlling method thereof |
US5761302A (en) | 1994-11-26 | 1998-06-02 | Lg Electronics Inc. | Copy prevention method and apparatus for digital video system |
US5778064A (en) | 1995-03-31 | 1998-07-07 | Sony Corporation | Apparatus and method for processing a high definition video signal |
US5790664A (en) | 1996-02-26 | 1998-08-04 | Network Engineering Software, Inc. | Automated system for management of licensed software |
US5799081A (en) | 1995-09-18 | 1998-08-25 | Lg Electronics Inc. | Illegal view/copy protection method and apparatus for digital broadcasting system |
US5832084A (en) | 1995-11-10 | 1998-11-03 | Lg Electronics, Inc. | Recording method of digital magnetic recording medium for copyright protection and variable speed playback |
US5862115A (en) | 1993-11-30 | 1999-01-19 | Victor Company Of Japan, Ltd. | Method and apparatus for recording an information signal with scrambling thereof |
US5881038A (en) * | 1994-04-18 | 1999-03-09 | Matsushita Electric Industrial Co., Ltd. | Method and apparatus for preventing illegal copy or illegal installation of information of optical recording medium |
US5898695A (en) | 1995-03-29 | 1999-04-27 | Hitachi, Ltd. | Decoder for compressed and multiplexed video and audio data |
US5907443A (en) | 1990-05-30 | 1999-05-25 | Canon Kabushiki Kaisha | Recording and reproducing apparatus adapted to selectively control the number of copies made |
US5910987A (en) | 1995-02-13 | 1999-06-08 | Intertrust Technologies Corp. | Systems and methods for secure transaction management and electronic rights protection |
US5925127A (en) | 1997-04-09 | 1999-07-20 | Microsoft Corporation | Method and system for monitoring the use of rented software |
US5956505A (en) | 1991-12-24 | 1999-09-21 | Pitney Bowes Inc. | Remote activation of software features in a data processing device |
US6009401A (en) | 1998-04-06 | 1999-12-28 | Preview Systems, Inc. | Relicensing of electronically purchased software |
US6236971B1 (en) | 1994-11-23 | 2001-05-22 | Contentguard Holdings, Inc. | System for controlling the distribution and use of digital works using digital tickets |
US6430290B1 (en) | 1998-01-23 | 2002-08-06 | Koninklijke Philips Electronics N.V. | Conditional access |
US7069250B2 (en) | 2001-10-15 | 2006-06-27 | Payformance Corporation | Check based online payment and verification system and method |
US7114745B2 (en) | 2002-12-10 | 2006-10-03 | Trw Automotive Safety Systems Gmbh | Monitoring system for detent connections |
US20070185814A1 (en) * | 2005-10-18 | 2007-08-09 | Intertrust Technologies Corporation | Digital rights management engine systems and methods |
US20070204078A1 (en) * | 2006-02-09 | 2007-08-30 | Intertrust Technologies Corporation | Digital rights management engine systems and methods |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4405829A (en) | 1977-12-14 | 1983-09-20 | Massachusetts Institute Of Technology | Cryptographic communications system and method |
US4571642A (en) | 1981-08-24 | 1986-02-18 | Hofstein Steven R | Method of and apparatus for modifying a video signal to prevent the unauthorized recording and reproduction thereof |
US4577216A (en) | 1983-11-14 | 1986-03-18 | Macrovision | Method and apparatus for modifying the color burst to prohibit videotape recording |
US4819098A (en) | 1983-11-23 | 1989-04-04 | Macrovision Corporation | Method and apparatus for clustering modifications made to a video signal to inhibit the making of acceptable videotape recordings |
US4964164A (en) | 1989-08-07 | 1990-10-16 | Algorithmic Research, Ltd. | RSA computation method for efficient batch processing |
DE4030026A1 (en) | 1990-09-22 | 1992-03-26 | Kodak Ag | DEVICE FOR LIMITING A ROTATIONAL MOVEMENT |
FI96157C (en) | 1992-04-27 | 1996-05-10 | Nokia Mobile Phones Ltd | Digital cellular radio telephone network based on time multiplexing to move a radio connection from the base station to a new base station |
-
1994
- 1994-11-26 KR KR1019940031373A patent/KR0152788B1/en not_active IP Right Cessation
-
1995
- 1995-11-22 US US08/562,042 patent/US5761302A/en not_active Expired - Lifetime
- 1995-11-26 CN CN95120356A patent/CN1123226C/en not_active Expired - Lifetime
- 1995-11-26 CN CNA2006100071337A patent/CN1822167A/en active Pending
- 1995-11-26 CN CN200410056681XA patent/CN1567993B/en not_active Expired - Lifetime
- 1995-11-26 CN CNB031073360A patent/CN1268126C/en not_active Expired - Lifetime
- 1995-11-26 CN CN200610055098.6A patent/CN1822668B/en not_active Expired - Lifetime
- 1995-11-26 CN CNA2006100071322A patent/CN1822166A/en active Pending
- 1995-11-26 CN CNB2003101179608A patent/CN1268127C/en not_active Expired - Lifetime
- 1995-11-26 CN CNA200510129704XA patent/CN1801919A/en active Pending
- 1995-11-26 CN CN200610055097.1A patent/CN1822667B/en not_active Expired - Lifetime
- 1995-11-26 CN CNB951203541A patent/CN1145576C/en not_active Expired - Fee Related
- 1995-11-26 CN CNA2006100071341A patent/CN1822168A/en active Pending
- 1995-11-27 JP JP7308005A patent/JP2898591B2/en not_active Expired - Lifetime
- 1995-11-27 JP JP7307915A patent/JP2824231B2/en not_active Expired - Lifetime
- 1995-11-27 EP EP95308482A patent/EP0717564B1/en not_active Expired - Lifetime
- 1995-11-27 DE DE69522424T patent/DE69522424D1/en not_active Expired - Lifetime
-
1998
- 1998-04-01 US US09/053,288 patent/US6028932A/en not_active Expired - Lifetime
-
2000
- 2000-02-03 US US09/497,465 patent/US6347144B1/en not_active Ceased
-
2003
- 2003-12-17 US US10/737,672 patent/USRE39319E1/en not_active Expired - Lifetime
- 2003-12-17 US US10/737,671 patent/USRE42950E1/en not_active Expired - Lifetime
-
2004
- 2004-08-02 US US10/909,248 patent/USRE42921E1/en not_active Expired - Lifetime
- 2004-11-05 US US10/981,797 patent/USRE42951E1/en not_active Expired - Lifetime
- 2004-11-09 HK HK04108794A patent/HK1066131A1/en not_active IP Right Cessation
- 2004-12-09 HK HK04109762A patent/HK1068000A1/en not_active IP Right Cessation
-
2005
- 2005-01-24 US US11/040,606 patent/USRE41074E1/en not_active Expired - Lifetime
- 2005-01-24 US US11/040,607 patent/USRE42922E1/en not_active Expired - Lifetime
- 2005-02-15 HK HK06112983.8A patent/HK1092626A1/en not_active IP Right Cessation
- 2005-02-15 HK HK06112984.7A patent/HK1092627A1/en not_active IP Right Cessation
- 2005-02-15 HK HK05101189.4A patent/HK1069049A1/en not_active IP Right Cessation
Patent Citations (105)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3753228A (en) | 1971-12-29 | 1973-08-14 | Westinghouse Air Brake Co | Synchronizing arrangement for digital data transmission systems |
US4420829A (en) | 1981-01-08 | 1983-12-13 | Carlson John E | Holographic system for the storage of audio, video and computer data |
USRE33189E (en) | 1981-11-19 | 1990-03-27 | Communications Satellite Corporation | Security system for SSTV encryption |
US4554461A (en) | 1982-12-24 | 1985-11-19 | Hitachi, Ltd. | Information transmitting apparatus |
US4736422A (en) | 1983-06-30 | 1988-04-05 | Independent Broadcasting Authority | Encrypted broadcast television system |
US4802215A (en) | 1983-07-22 | 1989-01-31 | Independent Broadcasting Authority | Security system for television signal encryption |
US4694489A (en) | 1983-12-22 | 1987-09-15 | Frederiksen Jeffrey E | Video transmission system |
US4890319A (en) | 1984-09-21 | 1989-12-26 | Scientific-Atlantic, Inc. | Method for controlling copying of protected information transmitted over a communications link |
US4975952A (en) | 1985-09-04 | 1990-12-04 | U. S. Philips Corporation | Method of data communication |
US4937679A (en) | 1986-08-11 | 1990-06-26 | Macrovision | Dual deck video recording apparatus having enhanced copy protection and method for providing enhanced copy protection to such a recording apparatus |
US4817140A (en) | 1986-11-05 | 1989-03-28 | International Business Machines Corp. | Software protection system using a single-key cryptosystem, a hardware-based authorization system and a secure coprocessor |
US4916738A (en) | 1986-11-05 | 1990-04-10 | International Business Machines Corp. | Remote access terminal security |
US5109413A (en) | 1986-11-05 | 1992-04-28 | International Business Machines Corporation | Manipulating rights-to-execute in connection with a software copy protection mechanism |
EP0267039A2 (en) | 1986-11-05 | 1988-05-11 | Satellite Technology Services, Inc. | Video system and method for controlled videotaping |
US4796220A (en) | 1986-12-15 | 1989-01-03 | Pride Software Development Corp. | Method of controlling the copying of software |
US4965680A (en) | 1987-06-30 | 1990-10-23 | Kabushiki Kaisha Toshiba | Apparatus for releasing a restriction on the recording of an information signal on a recording medium |
US5073925A (en) * | 1987-07-08 | 1991-12-17 | Matsushita Electric Industrial Co., Ltd. | Method and apparatus for the protection of signal copy |
US4999806A (en) | 1987-09-04 | 1991-03-12 | Fred Chernow | Software distribution system |
US4924513A (en) | 1987-09-25 | 1990-05-08 | Digital Equipment Corporation | Apparatus and method for secure transmission of data over an unsecure transmission channel |
US5057947A (en) | 1988-02-10 | 1991-10-15 | Matsushita Electric Industrial Co., Ltd. | Recording and reproducing apparatus with limited digital copying |
US5231546A (en) | 1988-02-10 | 1993-07-27 | Matsushita Electric Industrial Co., Ltd. | Recording and reproducing apparatus with limited digital copying |
US5014274A (en) | 1988-04-08 | 1991-05-07 | Victor Company Of Japan, Ltd. | Code-error correcting device |
US5034981A (en) * | 1988-04-11 | 1991-07-23 | Eidak Corporation | Anti-copying video signal processing |
US4871140A (en) | 1988-05-20 | 1989-10-03 | Moore Push-Pin Company | Hanging device |
US5134656A (en) | 1989-02-22 | 1992-07-28 | Kudelski S.A. Fabrique D'enregistruers Nagra | Pre-payment television system using a memory card associated with a decoder |
US5233650A (en) | 1989-03-03 | 1993-08-03 | Sun Plan Investments Limited | Telephone support device |
US6052242A (en) | 1989-06-07 | 2000-04-18 | Canon Kabushiki Kaisha | Recording apparatus with copy control based on copies made and allowed to be made |
US5034985A (en) | 1989-11-13 | 1991-07-23 | Pitney Bowes Inc. | Matched mailing system employing address print array recognition |
US5144658A (en) | 1989-11-24 | 1992-09-01 | Sharp Kabushiki Kaisha | Repeater of digital audio interface signal |
US5003590A (en) * | 1989-12-18 | 1991-03-26 | Eidak Corporation | Encoding an optical video disc to inhibit video tape recording |
US5159633A (en) | 1990-01-19 | 1992-10-27 | Canon Kabushiki Kaisha | Multimedia network system |
US5182680A (en) | 1990-02-26 | 1993-01-26 | Sony Corporation | Recording control system |
US5243650A (en) | 1990-03-23 | 1993-09-07 | Televerket | Method and apparatus for encryption/decryption of digital multisound in television |
US5054064A (en) | 1990-03-29 | 1991-10-01 | Gte Laboratories Incorporated | Video control system for recorded programs |
US5907443A (en) | 1990-05-30 | 1999-05-25 | Canon Kabushiki Kaisha | Recording and reproducing apparatus adapted to selectively control the number of copies made |
US5058162A (en) | 1990-08-09 | 1991-10-15 | Hewlett-Packard Company | Method of distributing computer data files |
US5193176A (en) | 1990-10-17 | 1993-03-09 | Powercard Supply C.A. | Computer work saving during power interruption |
EP0498617A2 (en) | 1991-02-07 | 1992-08-12 | Matsushita Electric Industrial Co., Ltd. | Digital signal transmitting method |
US5469272A (en) | 1991-03-05 | 1995-11-21 | Sony Corporation | Digital signal recording and/or reproducing apparatus |
US5138659A (en) | 1991-05-02 | 1992-08-11 | General Instrument Corporation | Conversion of television signal formats with retention of common control data stream |
US5303294A (en) | 1991-06-18 | 1994-04-12 | Matsushita Electric Industrial Co., Ltd. | Video theater system and copy preventive method |
EP0519320A2 (en) | 1991-06-18 | 1992-12-23 | Matsushita Electric Industrial Co., Ltd. | Video theater system and copy preventive method |
US5260999A (en) | 1991-06-28 | 1993-11-09 | Digital Equipment Corporation | Filters in license management system |
US5265164A (en) | 1991-10-31 | 1993-11-23 | International Business Machines Corporation | Cryptographic facility environment backup/restore and replication in a public key cryptosystem |
US5406625A (en) | 1991-11-22 | 1995-04-11 | Sony Corporation | Receiving apparatus and recording method |
US5956505A (en) | 1991-12-24 | 1999-09-21 | Pitney Bowes Inc. | Remote activation of software features in a data processing device |
US5215448A (en) * | 1991-12-26 | 1993-06-01 | Ingersoll-Dresser Pump Company | Combined boiler feed and condensate pump |
US5392351A (en) | 1992-03-16 | 1995-02-21 | Fujitsu Limited | Electronic data protection system |
JPH0670282A (en) | 1992-06-16 | 1994-03-11 | Matsushita Electric Ind Co Ltd | Video signal recording and reproducing device |
US5289276A (en) | 1992-06-19 | 1994-02-22 | General Electric Company | Method and apparatus for conveying compressed video data over a noisy communication channel |
US5377266A (en) | 1992-07-21 | 1994-12-27 | Matsushita Electric Industrial Co., Ltd. | Scramble apparatus and descramble apparatus |
EP0580367A2 (en) | 1992-07-24 | 1994-01-26 | Sony Corporation | Video signal transmission, recording and reproduction |
US5418853A (en) | 1992-07-24 | 1995-05-23 | Sony Corporation | Apparatus and method for preventing unauthorized copying of video signals |
USRE36763E (en) | 1992-07-24 | 2000-07-04 | Sony Corporation | Apparatus and method for preventing unauthorized copying of video signals |
EP0581227A2 (en) | 1992-07-28 | 1994-02-02 | Hitachi, Ltd. | Apparatus for the recording and/or the reproducing of video signals |
US5590306A (en) | 1992-09-08 | 1996-12-31 | Fuji Photo Film Co., Ltd. | Memory card management system for writing data with usage and recording codes made significant |
EP0589459A1 (en) | 1992-09-24 | 1994-03-30 | Matsushita Electric Industrial Co., Ltd. | Recording and reproducing apparatus |
US5323244A (en) | 1992-09-24 | 1994-06-21 | Matsushita Electric Industrial Co., Ltd. | Recording and reproducing apparatus |
JPH06162690A (en) | 1992-11-20 | 1994-06-10 | Sony Corp | Transmitter |
US5477276A (en) | 1992-12-17 | 1995-12-19 | Sony Corporation | Digital signal processing apparatus for achieving fade-in and fade-out effects on digital video signals |
JPH06199288A (en) | 1993-01-07 | 1994-07-19 | Permelec Electrode Ltd | Propulsion device in liquid |
US5315448A (en) | 1993-03-18 | 1994-05-24 | Macrovision Corporation | Copy protection for hybrid digital video tape recording and unprotected source material |
US5588058A (en) | 1993-03-31 | 1996-12-24 | U.S. Philips Corporation | Method and device for scrambling and descrambling of a specific television broadcast |
JPH06339110A (en) | 1993-04-02 | 1994-12-06 | Sony Corp | Picture information transmission system, picture information recorded and picture information reproduction device |
US5757910A (en) | 1993-04-06 | 1998-05-26 | Goldstar Co., Ltd. | Apparatus for preventing illegal copying of a digital broadcasting signal |
US5506903A (en) | 1993-04-06 | 1996-04-09 | Sony Corporation | Digital multiplex transmission system |
US5546461A (en) | 1993-04-09 | 1996-08-13 | Matsushita Electric Industrial Co., Ltd. | Scramble system for use in digital video signal recording and reproducing system or transmission and receiving system, comprising scramble apparatus and descramble apparatus |
US5442541A (en) | 1993-07-23 | 1995-08-15 | Xerox Corporation | Enabling features over common communication channel |
US5381481A (en) | 1993-08-04 | 1995-01-10 | Scientific-Atlanta, Inc. | Method and apparatus for uniquely encrypting a plurality of services at a transmission site |
US5530756A (en) | 1993-09-15 | 1996-06-25 | U.S. Philips Corporation | Television scrambling and descrambling method, and transmitter and receiver using said method |
US5646992A (en) | 1993-09-23 | 1997-07-08 | Digital Delivery, Inc. | Assembly, distribution, and use of digital information |
US5579120A (en) | 1993-10-08 | 1996-11-26 | Sony Corporation | Copyright protection for digital signal recording and/or reproduction and recording medium thereof |
US5576843A (en) | 1993-10-29 | 1996-11-19 | Time Warner Entertainment Co., L.P. | System and method for controlling play of multiple dialog audio tracks of a software carrier |
US5862115A (en) | 1993-11-30 | 1999-01-19 | Victor Company Of Japan, Ltd. | Method and apparatus for recording an information signal with scrambling thereof |
US5638513A (en) | 1993-12-22 | 1997-06-10 | Ananda; Mohan | Secure software rental system using continuous asynchronous password verification |
US5504816A (en) | 1994-02-02 | 1996-04-02 | Gi Corporation | Method and apparatus for controlling access to digital signals |
US5673357A (en) | 1994-02-15 | 1997-09-30 | Sony Corporation | Video recording, transmitting and reproducing apparatus with concurrent recording and transmitting or multiple dubbing of copy protected video signals |
US5881038A (en) * | 1994-04-18 | 1999-03-09 | Matsushita Electric Industrial Co., Ltd. | Method and apparatus for preventing illegal copy or illegal installation of information of optical recording medium |
US5563946A (en) | 1994-04-25 | 1996-10-08 | International Business Machines Corporation | Method and apparatus for enabling trial period use of software products: method and apparatus for passing encrypted files between data processing systems |
US5513260A (en) | 1994-06-29 | 1996-04-30 | Macrovision Corporation | Method and apparatus for copy protection for various recording media |
US5659613A (en) | 1994-06-29 | 1997-08-19 | Macrovision Corporation | Method and apparatus for copy protection for various recording media using a video finger print |
US5574787A (en) | 1994-07-25 | 1996-11-12 | Ryan; John O. | Apparatus and method for comprehensive copy protection for video platforms and unprotected source material |
US5629980A (en) | 1994-11-23 | 1997-05-13 | Xerox Corporation | System for controlling the distribution and use of digital works |
US6236971B1 (en) | 1994-11-23 | 2001-05-22 | Contentguard Holdings, Inc. | System for controlling the distribution and use of digital works using digital tickets |
US5715403A (en) | 1994-11-23 | 1998-02-03 | Xerox Corporation | System for controlling the distribution and use of digital works having attached usage rights where the usage rights are defined by a usage rights grammar |
US5761302A (en) | 1994-11-26 | 1998-06-02 | Lg Electronics Inc. | Copy prevention method and apparatus for digital video system |
US6028932A (en) | 1994-11-26 | 2000-02-22 | Lg Electronics Inc. | Copy prevention method and apparatus for digital video system |
US5757909A (en) | 1994-11-26 | 1998-05-26 | Lg Electronics, Inc. | Illegal view and copy protection method in digital video system and controlling method thereof |
US5689559A (en) | 1994-12-08 | 1997-11-18 | Lg Electronics Inc. | Copy prevention method and apparatus of a digital magnetic recording/reproducing system |
US5910987A (en) | 1995-02-13 | 1999-06-08 | Intertrust Technologies Corp. | Systems and methods for secure transaction management and electronic rights protection |
US5898695A (en) | 1995-03-29 | 1999-04-27 | Hitachi, Ltd. | Decoder for compressed and multiplexed video and audio data |
US5778064A (en) | 1995-03-31 | 1998-07-07 | Sony Corporation | Apparatus and method for processing a high definition video signal |
US5703859A (en) | 1995-09-01 | 1997-12-30 | Sony Corporation | Digital video copy protection system |
US5799081A (en) | 1995-09-18 | 1998-08-25 | Lg Electronics Inc. | Illegal view/copy protection method and apparatus for digital broadcasting system |
US5689561A (en) | 1995-10-06 | 1997-11-18 | Pace; Michael | Computer-based trading card system and method |
US5832084A (en) | 1995-11-10 | 1998-11-03 | Lg Electronics, Inc. | Recording method of digital magnetic recording medium for copyright protection and variable speed playback |
US5790664A (en) | 1996-02-26 | 1998-08-04 | Network Engineering Software, Inc. | Automated system for management of licensed software |
US5925127A (en) | 1997-04-09 | 1999-07-20 | Microsoft Corporation | Method and system for monitoring the use of rented software |
US6430290B1 (en) | 1998-01-23 | 2002-08-06 | Koninklijke Philips Electronics N.V. | Conditional access |
US6009401A (en) | 1998-04-06 | 1999-12-28 | Preview Systems, Inc. | Relicensing of electronically purchased software |
US7069250B2 (en) | 2001-10-15 | 2006-06-27 | Payformance Corporation | Check based online payment and verification system and method |
US7114745B2 (en) | 2002-12-10 | 2006-10-03 | Trw Automotive Safety Systems Gmbh | Monitoring system for detent connections |
US20070185814A1 (en) * | 2005-10-18 | 2007-08-09 | Intertrust Technologies Corporation | Digital rights management engine systems and methods |
US20100067705A1 (en) * | 2005-10-18 | 2010-03-18 | Intertrust Technologies Corp. | Digital rights management engine systems and methods |
US20070204078A1 (en) * | 2006-02-09 | 2007-08-30 | Intertrust Technologies Corporation | Digital rights management engine systems and methods |
Non-Patent Citations (9)
Title |
---|
Derfler, F. J. et al., "How Networks Work". |
Gralla, P., "How The Internet Works". |
ISO/IEC 13818-1, "Information Technology-Generic Coding of Moving Pictures and Associated Audio: Systems" International Standard, Nov. 13, 1994, 1-144 (all pages). |
ISO/IEC, 13818-2, "Information Technology-Generic Coding of Moving Pictures and Associated Audio Information Video", International Standard, 1995, pp. 1-243 (all pages). |
Muller, N. J., "Desktop Encyclopedia of the Internet". |
Strunk, Jr. et al., "The Elements of Style", Third Edition, MacMillan Publishing Co., Inc., 59 pages, 1979. |
Systems Working Committee, "MPEG-2 Systems Working Draft", International Organization for Standardization, ISO/IEC/JTC1/SC29/WG11N0601, 114 pages, Nov. 1993. |
Wasilewski, "MPEG-2 systems specification: Blueprint for network interoperability", Communications Technology, 8 pages, Feb. 1994. |
White, R., "How Computers Work". |
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US8190529B2 (en) * | 2002-07-30 | 2012-05-29 | Sony Mobile Communications Japan, Inc. | Information processing system, information communication terminal and method, information processing apparatus and method, recording medium, and program for internet transaction |
US20120134529A1 (en) * | 2010-11-28 | 2012-05-31 | Pedro Javier Vazquez | Method and apparatus for applying of a watermark to a video during download |
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