USRE42922E1 - Copy prevention method and apparatus for digital video system - Google Patents

Copy prevention method and apparatus for digital video system Download PDF

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USRE42922E1
USRE42922E1 US11040607 US4060705A USRE42922E1 US RE42922 E1 USRE42922 E1 US RE42922E1 US 11040607 US11040607 US 11040607 US 4060705 A US4060705 A US 4060705A US RE42922 E1 USRE42922 E1 US RE42922E1
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key
information
copy
digital
stream
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US11040607
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Tae Joon Park
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LG Electronics Inc
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LG Electronics Inc
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/76Television signal recording
    • H04N5/91Television signal processing therefor
    • H04N5/913Television signal processing therefor for scrambling ; for copy protection
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/76Television signal recording
    • H04N5/91Television signal processing therefor
    • H04N5/913Television signal processing therefor for scrambling ; for copy protection
    • H04N2005/91307Television signal processing therefor for scrambling ; for copy protection by adding a copy protection signal to the video signal
    • H04N2005/91328Television 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]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/76Television signal recording
    • H04N5/91Television signal processing therefor
    • H04N5/913Television signal processing therefor for scrambling ; for copy protection
    • H04N2005/91357Television signal processing therefor for scrambling ; for copy protection by modifying the video signal
    • H04N2005/91364Television signal processing therefor for scrambling ; for copy protection by modifying the video signal the video signal being scrambled
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00Details of colour television systems
    • H04N9/79Processing of colour television signals in connection with recording
    • H04N9/80Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N9/804Transformation 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
    • H04N9/8042Transformation 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
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00Details of colour television systems
    • H04N9/79Processing of colour television signals in connection with recording
    • H04N9/80Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N9/804Transformation 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
    • H04N9/806Transformation 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
    • H04N9/8063Transformation 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
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00Details of colour television systems
    • H04N9/79Processing of colour television signals in connection with recording
    • H04N9/80Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N9/82Transformation 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
    • H04N9/8205Transformation 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

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, 10/737,672 (now U.S. Pat. No. Re. 39,319), Ser. No. 11/040,606 (now U.S. Pat. No. Re. 41,074), and Ser. No. 11/040,607 (the present application) which are all reissues of U.S. Pat. No. 6,347,144; Ser. Nos. 10/981,797, 10/737,672, 10/909,248 and 10/981,798 which are all divisionals of Ser. No. 10/737,672; Ser. No. 12/139,161 which is a continuation of Ser. No. 10/909,248; and Ser. Nos. 12/405,011 and 12/405,053 which are both divisionals of Ser. No. 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.

BACKGROUND OF THE INVENTION

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, there is presented a method in which a phase noise or other corrected signal is inserted into the chrome 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) 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, 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 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 EPPK 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.

Key decrypter 108 receiving the key information from key supply portion 107 outputs an algorithm DPK B corresponding to encryption algorithm EPK B, decrypter 109 decrypts (DPK B(c))=m) the output of encrypter 106 with decryption algorithm DPK B, and then transmits user B. In other words, only user B can decrypt decryption algorithm DPK B corresponding to encryption algorithm EPK B.

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 to present illegal view. However, there is no method of protecting a program distributed through a digital storage medium such as digital VCR.

SUMMARY OF THE INVENTION

Therefore, it is an object of the present invention to an illegal copy prevention method and apparatus for a digital video system in which, in copy tape, 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.

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 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 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.

BRIEF DESCRIPTION OF THE ATTACHED DRAWINGS

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 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; and

FIGS. 11A-11D show examples of a bit stream of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

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 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, 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, 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, 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 group of picture (GOP), the respective GOPs are classified by their cop 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, 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.

As embodiment of the present invention shown in FIG. 5 for performing such 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 formal 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.

PES header detector 10 for detecting the PES header is formed as shown in FIG. 7. When 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.

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.

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 (39)

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 digital data system, the method comprising:
detecting, via a decryption device included in the digital data system, key information and copy prevention information from received digital data or from a signal reproduced from a digital recording medium, the key information for decrypting digital content from the received digital data or from the signal, the copy prevention information for indicating at least whether or not a copy of the digital content is permitted; and
controlling, via a controller within the digital data system, a copy protection function for the digital content based on the copy prevention information and the key information,
wherein said controlling step controls the copy protection function such that the digital content is not copied, when the copy prevention information indicates that a copy is not permitted, and
wherein said copy protection function includes identifying whether the digital content is encrypted based on classification information detected from the digital data, and decrypting, via the decryption device according to control of the controller, the digital content based on the key information if the digital content is encrypted.
33. The method of claim 32, wherein said controlling step (b) controls the copy protection function such that the digital content is decrypted only when the key information is detected.
34. The method of claim 32, wherein the copy prevention information includes information indicating a first recording source can copy the digital content onto a first recording medium but a second recording source can then not copy the digital content from the first recording medium to a second different recording medium.
35. An apparatus for copy prevention, comprising:
a receiving device configured to receive a digital data stream;
a detecting device configured to detect an encryption key from the received digital data stream, and to detect copy prevention information from the received digital data stream, the encryption key for decrypting digital content from the received digital data stream and the copy prevention information for indicating whether or not a copy of the digital content of the digital data stream is permitted; and
a controller configured to control a copy protection function for the digital content based on the detected copy prevention information and key information,
wherein said controller is configured to control the copy protection function such that the digital content is not copied, when the copy prevention information indicates that a copy is not permitted, and
wherein said controller is configured to identify whether the digital content is encrypted based on classification information detected from the digital data stream, and control to decrypt the digital content based on the key information if the digital data stream is encrypted.
36. The apparatus of claim 35, further comprising:
a decryption device configured to decrypt the digital content based on the encryption key, according to the control of the controller.
37. The apparatus of claim 36, wherein said decryption device is configured to operate on units of predetermined blocks of the digital content, according to the control of the controller.
38. The apparatus of claim 35, wherein the encryption key is predetermined by the digital content.
39. The apparatus of claim 35, wherein the copy prevention information includes information indicating a first recording source can copy the digital content onto a first recording medium but a second recording source can then not copy the digital content from the first recording medium to a second different recording medium.
US11040607 1994-11-26 2005-01-24 Copy prevention method and apparatus for digital video system Expired - Lifetime USRE42922E1 (en)

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KR19940031373A KR0152788B1 (en) 1994-11-26 1994-11-26 Copy protecting method and apparatus of digital image system
US08562042 US5761302A (en) 1994-11-26 1995-11-22 Copy prevention method and apparatus for digital video system
US09053288 US6028932A (en) 1994-11-26 1998-04-01 Copy prevention method and apparatus for digital video system
US09497465 US6347144B1 (en) 1994-11-26 2000-02-03 Copy prevention method and apparatus for digital video system
US11040607 USRE42922E1 (en) 1994-11-26 2005-01-24 Copy prevention method and apparatus for digital video system

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US09497465 Expired - Lifetime US6347144B1 (en) 1994-11-26 2000-02-03 Copy prevention method and apparatus for digital video system
US10737671 Expired - Lifetime USRE42950E1 (en) 1994-11-26 2003-12-17 Copy prevention method and apparatus for digital video system
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US09497465 Expired - Lifetime US6347144B1 (en) 1994-11-26 2000-02-03 Copy prevention method and apparatus for digital video system
US10737671 Expired - Lifetime USRE42950E1 (en) 1994-11-26 2003-12-17 Copy prevention method and apparatus for digital video system
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Cited By (2)

* Cited by examiner, † Cited by third party
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
US20130202110A1 (en) * 2012-02-08 2013-08-08 Vixs Systems, Inc. Container agnostic decryption device and methods for use therewith

Families Citing this family (138)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
JP3467964B2 (en) * 1995-08-10 2003-11-17 ソニー株式会社 Data recording apparatus and method, a data reproducing apparatus 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
US7221853B1 (en) 1996-09-05 2007-05-22 Sony Corporation Digital recording apparatus and copyright protection method thereof
US6298196B1 (en) 1996-09-05 2001-10-02 Sony Corporation Digital recording apparatus and copyright protection method thereof
JP3941178B2 (en) 1996-09-05 2007-07-04 ソニー株式会社 Recording medium, digital recording devices, and control ic
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 a receiving method
JP3891230B2 (en) * 1997-05-29 2007-03-14 ソニー株式会社 Additional information superimposition device and the 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
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 Reproducing apparatus and reproducing method of the 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, the information signal processing apparatus, an information signal reproducing method and information signal output method
US6584552B1 (en) 1998-11-02 2003-06-24 Matsushita Electric Industrial Co., Ltd. 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
CN1180567C (en) * 1999-03-15 2004-12-15 索尼公司 Data processing method, device and system for transmission of encrypted data
KR100700508B1 (en) * 1999-03-18 2007-03-28 엘지전자 주식회사 Copyright protection apparatus for multimedia transmission system
US7730300B2 (en) * 1999-03-30 2010-06-01 Sony Corporation Method and apparatus for protecting the transfer of data
US7747853B2 (en) 2001-06-06 2010-06-29 Sony Corporation IP delivery of secure digital content
US6697489B1 (en) * 1999-03-30 2004-02-24 Sony Corporation Method and apparatus for securing control words
US6912513B1 (en) 1999-10-29 2005-06-28 Sony Corporation Copy-protecting management using a user scrambling key
US7010685B1 (en) 1999-11-09 2006-03-07 Sony Corporation Method and apparatus for storing scrambled digital programs by filtering product identifier
US7039614B1 (en) * 1999-11-09 2006-05-02 Sony Corporation Method for simulcrypting scrambled data to a plurality of conditional access devices
JP3740917B2 (en) * 1999-11-26 2006-02-01 日本ビクター株式会社 Recording method and a recording medium
US6701528B1 (en) * 2000-01-26 2004-03-02 Hughes Electronics Corporation Virtual video on demand using multiple encrypted video segments
US6711553B1 (en) * 2000-02-25 2004-03-23 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 playback method, and 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 extracting device and elementary stream extracting 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
US20030206631A1 (en) * 2000-06-22 2003-11-06 Candelore Brant L. Method and apparatus for scrambling program data for furture viewing
US20040205812A1 (en) * 2000-06-22 2004-10-14 Candelore Brant L. Method and apparatus for routing program data in a program viewing unit
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
US6853728B1 (en) * 2000-07-21 2005-02-08 The Directv Group, Inc. Video on demand pay per view services with unmodified conditional access functionality
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
US7457414B1 (en) 2000-07-21 2008-11-25 The Directv Group, Inc. Super encrypted storage and retrieval of media programs with smartcard generated keys
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
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
US7181017B1 (en) 2001-03-23 2007-02-20 David Felsher System and method for secure three-party communications
US7215770B2 (en) * 2002-01-02 2007-05-08 Sony Corporation System and method for partially encrypted multimedia stream
US7376233B2 (en) * 2002-01-02 2008-05-20 Sony Corporation Video slice and active region based multiple partial encryption
US7218738B2 (en) * 2002-01-02 2007-05-15 Sony Corporation Encryption and content control in a digital broadcast system
US7895616B2 (en) * 2001-06-06 2011-02-22 Sony Corporation Reconstitution of program streams split across multiple packet identifiers
US7233669B2 (en) * 2002-01-02 2007-06-19 Sony Corporation Selective encryption to enable multiple decryption keys
US7765567B2 (en) * 2002-01-02 2010-07-27 Sony Corporation Content replacement by PID mapping
US7302059B2 (en) * 2002-01-02 2007-11-27 Sony Corporation Star pattern partial encryption
US7155012B2 (en) * 2002-01-02 2006-12-26 Sony Corporation Slice mask and moat pattern partial encryption
US7039938B2 (en) * 2002-01-02 2006-05-02 Sony Corporation Selective encryption for video on demand
US7336787B2 (en) * 2001-06-06 2008-02-26 Sony Corporation Critical packet partial encryption
US7823174B2 (en) * 2002-01-02 2010-10-26 Sony Corporation Macro-block based content replacement by PID mapping
US7350082B2 (en) * 2001-06-06 2008-03-25 Sony Corporation Upgrading of 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
EP1436943B1 (en) * 2001-09-21 2016-11-02 The DIRECTV Group, Inc. Method and apparatus for controlling paired operation of a conditional access module and an 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
US8645988B2 (en) * 2002-12-13 2014-02-04 Sony Corporation Content personalization for digital content
US8667525B2 (en) * 2002-12-13 2014-03-04 Sony Corporation Targeted advertisement selection from a digital stream
US9118941B2 (en) * 2002-02-22 2015-08-25 Cisco Technology Inc. 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 and reproducing 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
US7242773B2 (en) * 2002-09-09 2007-07-10 Sony Corporation Multiple partial encryption using retuning
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
US7724907B2 (en) 2002-11-05 2010-05-25 Sony Corporation Mechanism for protecting the transfer of digital content
US8572408B2 (en) * 2002-11-05 2013-10-29 Sony Corporation Digital rights management of a digital device
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
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
KR100972831B1 (en) * 2003-04-24 2010-07-28 엘지전자 주식회사 Protectiog method of encrypted data and reprodecing apparatus therof
KR100974449B1 (en) * 2003-04-24 2010-08-10 엘지전자 주식회사 Method for managing a copy protection information of optical disc
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
US7532804B2 (en) * 2003-06-23 2009-05-12 Seiko Epson Corporation Method and apparatus for video copy detection
US7706532B2 (en) * 2003-07-14 2010-04-27 Sony Corporation Encryption/decryption device and method
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 Encryption device and the editing device and their method of transport stream
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
US7346163B2 (en) * 2003-10-31 2008-03-18 Sony Corporation Dynamic composition of pre-encrypted video on demand content
US7263187B2 (en) * 2003-10-31 2007-08-28 Sony Corporation Batch mode session-based encryption of video on demand content
US7853980B2 (en) * 2003-10-31 2010-12-14 Sony Corporation Bi-directional indices for trick mode video-on-demand
US7620180B2 (en) * 2003-11-03 2009-11-17 Sony Corporation Preparation of content for multiple conditional access methods in video on demand
US20050102702A1 (en) * 2003-11-12 2005-05-12 Candelore Brant L. Cablecard with content manipulation
JP4418431B2 (en) * 2003-11-14 2010-02-17 パナソニック株式会社 Data processing equipment
US7343013B2 (en) * 2003-12-16 2008-03-11 Sony Corporation Composite session-based encryption of video on demand content
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
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
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
US8041190B2 (en) 2004-12-15 2011-10-18 Sony Corporation System and method for the creation, synchronization and delivery of alternate content
US7895617B2 (en) * 2004-12-15 2011-02-22 Sony Corporation Content substitution editor
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 The information processing system, the reproducing terminal apparatus and reproducing method, an information processing apparatus and method, and program
EP1872264A4 (en) * 2005-04-13 2010-07-07 Store Eyes Inc Method and system for automatically measuring retail store 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
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
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
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
US9178693B2 (en) 2006-08-04 2015-11-03 The Directv Group, Inc. Distributed media-protection systems and methods to operate the same
US9225761B2 (en) 2006-08-04 2015-12-29 The Directv Group, Inc. Distributed media-aggregation 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 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
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
EP2645917A4 (en) * 2010-12-01 2013-12-04 Techtronic Floor Care Tech Ltd Wheel assembly for a vacuum cleaner
JP2012016053A (en) * 2011-09-02 2012-01-19 Hitachi Consumer Electronics Co Ltd Digital signal processing device
CN105576589B (en) * 2014-10-14 2018-02-02 北京星光影视设备科技股份有限公司 Follower retractable cable winding damping means

Citations (94)

* Cited by examiner, † Cited by third party
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
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
US5034985A (en) 1989-11-13 1991-07-23 Pitney Bowes Inc. Matched mailing system employing address print array recognition
US5034981A (en) 1988-04-11 1991-07-23 Eidak Corporation Anti-copying video signal processing
US5054064A (en) 1990-03-29 1991-10-01 Gte Laboratories Incorporated Video control system for recorded programs
US5057947A (en) 1988-02-10 1991-10-15 Matsushita Electric Industrial Co., Ltd. Recording and reproducing apparatus with limited digital copying
US5058162A (en) 1990-08-09 1991-10-15 Hewlett-Packard Company Method of distributing computer data files
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
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 De Nora Permelec Spa Under liquid propulsion device
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
US5689561A (en) 1995-10-06 1997-11-18 Pace; Michael Computer-based trading card system and method
US5689559A (en) 1994-12-08 1997-11-18 Lg Electronics Inc. Copy prevention method and apparatus of a digital magnetic recording/reproducing system
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

Family Cites Families (11)

* Cited by examiner, † Cited by third party
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
US4871140A (en) 1988-05-20 1989-10-03 Moore Push-Pin Company Hanging device
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
US5215448A (en) * 1991-12-26 1993-06-01 Ingersoll-Dresser Pump Company Combined boiler feed and condensate pump
FI96157C (en) 1992-04-27 1996-05-10 Nokia Mobile Phones Ltd Digital, cellular radio based on time division multiplexing radio telephone network to transfer the radio connection to the base station to the new base station
US9626667B2 (en) * 2005-10-18 2017-04-18 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

Patent Citations (100)

* Cited by examiner, † Cited by third party
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
EP0267039A2 (en) 1986-11-05 1988-05-11 Satellite Technology Services, Inc. Video system and method for controlled videotaping
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
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
US5231546A (en) 1988-02-10 1993-07-27 Matsushita Electric Industrial Co., Ltd. Recording and reproducing apparatus with limited digital copying
US5057947A (en) 1988-02-10 1991-10-15 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
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
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
USRE36763E (en) * 1992-07-24 2000-07-04 Sony Corporation Apparatus and method for preventing unauthorized copying of video signals
US5418853A (en) 1992-07-24 1995-05-23 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
US5323244A (en) 1992-09-24 1994-06-21 Matsushita Electric Industrial Co., Ltd. Recording and reproducing apparatus
EP0589459A1 (en) 1992-09-24 1994-03-30 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 De Nora Permelec Spa Under liquid propulsion device
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
US5506903A (en) 1993-04-06 1996-04-09 Sony Corporation Digital multiplex transmission system
US5757910A (en) 1993-04-06 1998-05-26 Goldstar Co., Ltd. Apparatus for preventing illegal copying of a digital broadcasting signal
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
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
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
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
US6028932A (en) 1994-11-26 2000-02-22 Lg Electronics Inc. Copy prevention method and apparatus for digital video system
US5761302A (en) 1994-11-26 1998-06-02 Lg Electronics Inc. Copy prevention method and apparatus for digital video system
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

Non-Patent Citations (11)

* Cited by examiner, † Cited by third party
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 13818-1, "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).
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".

Cited By (7)

* Cited by examiner, † Cited by third party
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
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
US20130202110A1 (en) * 2012-02-08 2013-08-08 Vixs Systems, Inc. Container agnostic decryption device and methods for use therewith
US9008308B2 (en) * 2012-02-08 2015-04-14 Vixs Systems, Inc Container agnostic decryption device and methods for use therewith
US20150181308A1 (en) * 2012-02-08 2015-06-25 Vixs Systems, Inc. Container agnostic decryption device and methods for use therewith
US20160013930A1 (en) * 2012-02-08 2016-01-14 Vixs Systems, Inc. Container agnostic decryption device and methods for use therewith
US9641322B2 (en) * 2012-02-08 2017-05-02 Vixs Systems, Inc. Container agnostic decryption device and methods for use therewith

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CN1822668A (en) 2006-08-23 application
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CN1801919A (en) 2006-07-12 application
USRE39319E1 (en) 2006-10-03 grant
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CN1268127C (en) 2006-08-02 grant
CN1822167A (en) 2006-08-23 application
CN1822667A (en) 2006-08-23 application
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EP0717564B1 (en) 2001-08-29 grant
CN1516464A (en) 2004-07-28 application
CN1567993B (en) 2012-03-28 grant
JPH08252200A (en) 1996-10-01 application
US6028932A (en) 2000-02-22 grant
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EP0717564A2 (en) 1996-06-19 application
USRE42921E1 (en) 2011-11-15 grant
CN1822668B (en) 2014-06-25 grant
CN1567993A (en) 2005-01-19 application
CN1123226C (en) 2003-10-01 grant
US6347144B1 (en) 2002-02-12 grant
JP2898591B2 (en) 1999-06-02 grant
CN1505399A (en) 2004-06-16 application
CN1131528A (en) 1996-09-25 application
USRE42951E1 (en) 2011-11-22 grant
EP0717564A3 (en) 1997-07-16 application
JPH08273299A (en) 1996-10-18 application
USRE41074E1 (en) 2010-01-12 grant
CN1822667B (en) 2014-03-12 grant
JP2824231B2 (en) 1998-11-11 grant
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USRE42950E1 (en) 2011-11-22 grant
CN1822166A (en) 2006-08-23 application

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