|Publication number||USRE42950 E1|
|Application number||US 10/737,671|
|Publication date||22 Nov 2011|
|Filing date||17 Dec 2003|
|Priority date||26 Nov 1994|
|Also published as||CN1123226C, CN1131528A, CN1145576C, CN1150737A, CN1268126C, CN1268127C, CN1505399A, CN1516464A, CN1567993A, CN1567993B, CN1801919A, CN1822166A, CN1822167A, CN1822168A, CN1822667A, CN1822667B, CN1822668A, CN1822668B, DE69522424D1, EP0717564A2, EP0717564A3, EP0717564B1, US5761302, US6028932, US6347144, USRE39319, USRE41074, USRE42921, USRE42922, USRE42951|
|Publication number||10737671, 737671, US RE42950 E1, US RE42950E1, US-E1-RE42950, USRE42950 E1, USRE42950E1|
|Inventors||Tae Joon Park|
|Original Assignee||Lg Electronics Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (105), Non-Patent Citations (11), Referenced by (6), Classifications (23), Legal Events (2)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This isNotice: More than one reissue applications have been filed for the reissue of U.S. Pat. No. 6,347,144. The reissue applications are application Ser. Nos. 10/737,671 (the present application), 10/737,672 (now RE. 39,319), 11/040,606 (now RE. 41,074), and 11/040,607 which are all reissues of U.S. Pat. No. 6,347,144; 10/981,797, 10/737,672, 10/909,248 and 10/981,798 which are all divisionals of 10/737,672; 12/139,161 which is a continuation of 10/909,248; and 12/405,011 and 12/405,053 which are both divisionals of 10/981,798, U.S. Pat. No. 6,347,144 resulted from application Ser. No. 09/497,465, which is a continuation of application Ser. No. 09/053,288, filed Apr. 1, 1998, now U.S. Pat. No. 6,028,932, which is a continuation of Ser. No. 08/562,042, filed Nov. 22, 1995, now U.S. Pat. No. 5,761,302, issued Jun. 2, 1998.
The present invention relates to a copy prevention technology for a digital video system, and more particularly, to a copy prevention method and apparatus for a digital VCR to which encryption is introduced to display a picture only in a VCR internally containing a corresponding encryption code, thereby preventing tape from being copied.
General copy prevention methods for analog VCR are presented in U.S. Pat. Nos. 4,819,098, 4,571,642 and 4,577,216.
First, U.S. Pat. NO. 4,819,098 discloses a method in which an interference signal is inserted into a video waveform in an automatic gain control circuit (AGC) of a VCR. Here, the inserted signal does not affect the AGC of its monitor but has the AGC of the VCR record an accurate level of signal on a video tape.
In U.S. Pat. No. 4,571,642 4,577,216, there is presented a method in which a phase noise or other corrected signal is inserted into the chrome chroma burst of a video waveform.
However, all the conventional technologies insert a distributing signal to an analog signal using the difference between a circuit of a monitor and a corresponding circuit of a VCR. Some VCRs may perform copy normally despite of copy prevention. Some monitors cannot display images of the original video tape. A conventional copy prevention introduced to an analog VCR system is hard to be applied to digital storage media (DSM).
Specifically, in a satellite receiver or high-definition TV decoder, as shown in
The PES header contains a PES header flag area of 14 bits which is a field for DSM such as digital VCR, and a PES header field having a variable length. The PES header flag area includes 1-bit copyright (CR) flag, 1-bit original-or-copy (OC) flag, 2-bit PD flag, 1-bit TM flag, and 1-bit AC flag.
The PES header field varies in length, and part thereof is set by the PC PD, TM and AC flags. A PTS/DTS area is not present if the value of the PD flag is “00”. It is 40 bits if the value “10”. If the value is “11”, the area is 80 bits. A DSM trick mode field is not present if the TM flag is “0”. If the flag is “1”, the field is 8 bits. An additional copy information field is 8 bits if the AC flag is “1”.
When recording is carried out by the satellite receiver or high-definition TV decoder and compressed video data is encoded in encoder 101, it is converted into a packet form in packet processing portion 122 102 as shown in
When the outputs of packet processing portions 102 and 104 are multiplexed in transmission multiplexer 105, a fixed transmission stream shown in
This public-key encryption system has all users U hold unique encryption algorithm EPK U and description algorithm DPK U. Here, encryption algorithm EPK U for the public-key is opened as a public-key to key supply portion 107. Decryption algorithm DPK U for secret key is kept in secret. The characteristics of EPK U and DPK U are as follows.
First, with respect to all users U and message m transmitted, DPK U(EPK U(m))=m.
Second, encryption algorithm EPK U and decryption algorithm DPK U do not require complicated calculation.
Third, it is impossible to find DPK″ U satisfying DPK″ U(EPK U(m))=m from encryption algorithm EPK U.
In the encryption system having the above characteristics, as shown in
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 to 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 intended to present prevent illegal view viewing. However, there is no method of protecting a program distributed through a digital storage medium, such as a digital VCR.
Therefore, it is an object of the present invention to provide an illegal copy prevention method and apparatus for a digital video system in which, in copy tape, with encrypted key information is transmitted and recorded so that a copied tape is reproducible only in a VCR having a corresponding encrypted key information, thereby prevented copy preventing copy.
To accomplish the object of the present invention, there is provided a copy prevention method for a digital video system comprising the steps of: (a) adding a header area of a header start code and key field to a reproduced bit stream; (b) decrypting and transmitting the bit stream to which the header area is added; (c) detecting a key field of the decrypted and transmitted bit stream and detecting copy prevention information; and (d) encrypting the bit stream according to information detected from step (c) and recording it on tape.
For the object of the present invention, there is provided a copy prevention apparatus for a digital video system comprising: a reproduction block for adding key information to a reproduced bit stream, and decrypting and transmitting it; and a recording block for searching key information of the bit stream transmitted from the reproduction block is to extract copy prevention information, and encrypting and recording the bit stream according to the extracted copy prevention information.
The reproduction block comprises: reproduction means for reproducing data recorded on tape; key insertion means for adding key information to the bit stream of the reproduction means; and decryption means for decrypting the output of the key insertion means and transmitting it to a recording-side VCR.
The recording block comprises: key detecting/correcting means for detecting key information from the transmitted bit stream of a reproducing-side VCR: copy prevention information detecting means for searching the key information detected from the key detecting/correcting means to detect copy prevention information; encrypting means for encrypting the bit stream according to the copy prevention information of the copy prevention information detecting means; and recording means for recording the bit stream encrypted in the encrypting means.
The copy prevention information detecting means comprises: a PES header detecting portion for detecting a PES header from parallel data output from the key detecting/correcting means; and a copy prevention information extractor enabled by a PES header detection signal of the PES header detecting portion to detect an additional copy information field.
Hereinafter, a preferred embodiment of the present invention will be described below with reference to the attached drawings.
As shown in
As shown in
The operation and effect of the present invention will be explained below. Generally, in case of reproducing or copy recording data on tapa tape, connections between systems are made as shown in
With those connections, an MPEG bit stream reproduced from VCR A is input to a satellite receiver or high-definition TV so that it cannot be recognized whether the stream is displayed on a screen or input to VCR B and recorded on another video tape.
For this reason, according to the present invention, in case that the bit stream reproduced from VCR A is copied from VCR B, information on copy prevention is transmitted to VCR B from VCR A. VCR B analyzes this information which is recorded with the bit stream.
Here, the insertion position of the copy prevention information contained in a GA bit stream is very limited because it must not affect decoding of the decoder of the satellite receiver or high-definition TV so that an image is displayed normally on a monitor. The copy prevention information may be inserted into the front end of the MPEG bit stream or inside the PES header.
When the MPEG bit stream is decoded in units or of group of picture (GOP), the respective GOPs are classified by their cop GOP start codes. This is useful in transmitting initialization data to a recording-side VCR because decoding is never affected even when a slight amount of data is added to the front end of the MPEG bit stream.
The case of inserting the copy prevention information into the PES header is useful in repeated transmission of information because copy prevention of a recording medium such as DSM is decided using CR and OC flaps of the PES header and additional copy information field. In this case, there are a variety of copy preventing methods.
First, when a mode of “No Copy” is detected from the additional copy information field of the PES header, VCR B is not able to enter its recording mode.
Second, when a mode of “Copy Permitted” is detected in order to implement a copy prevention such as DAT mode, VCR B records but “No Copy” mode is recorded in the additional copy information field to interrupt recopying from a copying tape. This means that a secondary source tape can be made, but a third source tape cannot.
Third, for “Back-up Copy”, tape B copied from VCR B is reproducible normally only in VCR A. According to this method, reproducing-side VCR A encrypts the bit stream with its own inherent key and records it on tape so that only reproducing-side VCR A decrypts the MPEG bit stream recording on the tape. For every VCR set, a unique key is provided, encrypted by VCR's key and recorded on tape B. However, the VCR set for recording tape B is VCR B and tape B is encrypted by VCR A's key so that VCR A's key needs to be transmitted to VCR B with GA bit stream.
Accordingly, when the key information of VCR A is transmitted as a header in advance prior to the bit stream in the “Back-up Copy”, it is recorded at the front end of tape B, which satisfies the insertion position of the copy prevention information mentioned before.
Here, as shown in
In case of recording the bit stream shown in
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
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
When copying tape B is reproduced in reproducing-side VCR A, key Y can be restored by decryption DPK A[EPK A(Y)] in which data is decrypted properly. In other VCRs, key Y cannot be found, which disables the decryption of the bit stream.
AsAn embodiment of the present invention, shown in
When playback starts for tape copying, reproducing portion 1 detects data recorded on tape as shown in
When the bit stream of
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
PES header detector 10 for detecting the PES header is formed as shown in
Here, packet start code detecting portion 13 searches the bit stream shown in
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
Here, copy prevention information extractor 20 for detecting the copy prevention information is formed as shown in
D-flipflop 23 is synchronized to the CR flag or the output of D-flipflop 21 shown in
Copy prevention position detector 25 searches the PD, TM and AC flags of the parallel data of PES header detector 10 shown in
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
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.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US3753228||29 Dec 1971||14 Aug 1973||Westinghouse Air Brake Co||Synchronizing arrangement for digital data transmission systems|
|US4420829||8 Jan 1981||13 Dec 1983||Carlson John E||Holographic system for the storage of audio, video and computer data|
|US4554461||22 Dec 1983||19 Nov 1985||Hitachi, Ltd.||Information transmitting apparatus|
|US4694489||10 Jul 1986||15 Sep 1987||Frederiksen Jeffrey E||Video transmission system|
|US4736422||2 Jul 1984||5 Apr 1988||Independent Broadcasting Authority||Encrypted broadcast television system|
|US4796220||15 Dec 1986||3 Jan 1989||Pride Software Development Corp.||Method of controlling the copying of software|
|US4802215||2 Jul 1984||31 Jan 1989||Independent Broadcasting Authority||Security system for television signal encryption|
|US4817140||5 Nov 1986||28 Mar 1989||International Business Machines Corp.||Software protection system using a single-key cryptosystem, a hardware-based authorization system and a secure coprocessor|
|US4871140||20 May 1988||3 Oct 1989||Moore Push-Pin Company||Hanging device|
|US4890319||8 Sep 1988||26 Dec 1989||Scientific-Atlantic, Inc.||Method for controlling copying of protected information transmitted over a communications link|
|US4916738||5 Nov 1986||10 Apr 1990||International Business Machines Corp.||Remote access terminal security|
|US4924513||14 Apr 1989||8 May 1990||Digital Equipment Corporation||Apparatus and method for secure transmission of data over an unsecure transmission channel|
|US4937679||23 Jun 1988||26 Jun 1990||Macrovision||Dual deck video recording apparatus having enhanced copy protection and method for providing enhanced copy protection to such a recording apparatus|
|US4965680||30 Jun 1988||23 Oct 1990||Kabushiki Kaisha Toshiba||Apparatus for releasing a restriction on the recording of an information signal on a recording medium|
|US4975952||11 May 1988||4 Dec 1990||U. S. Philips Corporation||Method of data communication|
|US4999806||4 Sep 1987||12 Mar 1991||Fred Chernow||Software distribution system|
|US5003590 *||18 Dec 1989||26 Mar 1991||Eidak Corporation||Encoding an optical video disc to inhibit video tape recording|
|US5014274||7 Apr 1989||7 May 1991||Victor Company Of Japan, Ltd.||Code-error correcting device|
|US5034981 *||27 Dec 1989||23 Jul 1991||Eidak Corporation||Anti-copying video signal processing|
|US5034985||13 Nov 1989||23 Jul 1991||Pitney Bowes Inc.||Matched mailing system employing address print array recognition|
|US5054064||29 Mar 1990||1 Oct 1991||Gte Laboratories Incorporated||Video control system for recorded programs|
|US5057947||8 Feb 1989||15 Oct 1991||Matsushita Electric Industrial Co., Ltd.||Recording and reproducing apparatus with limited digital copying|
|US5058162||9 Aug 1990||15 Oct 1991||Hewlett-Packard Company||Method of distributing computer data files|
|US5073925 *||13 Jun 1990||17 Dec 1991||Matsushita Electric Industrial Co., Ltd.||Method and apparatus for the protection of signal copy|
|US5109413||28 Nov 1989||28 Apr 1992||International Business Machines Corporation||Manipulating rights-to-execute in connection with a software copy protection mechanism|
|US5134656||21 Feb 1990||28 Jul 1992||Kudelski S.A. Fabrique D'enregistruers Nagra||Pre-payment television system using a memory card associated with a decoder|
|US5138659||2 May 1991||11 Aug 1992||General Instrument Corporation||Conversion of television signal formats with retention of common control data stream|
|US5144658||20 Nov 1990||1 Sep 1992||Sharp Kabushiki Kaisha||Repeater of digital audio interface signal|
|US5159633||15 Jan 1991||27 Oct 1992||Canon Kabushiki Kaisha||Multimedia network system|
|US5182680||22 Feb 1991||26 Jan 1993||Sony Corporation||Recording control system|
|US5193176||17 Oct 1990||9 Mar 1993||Powercard Supply C.A.||Computer work saving during power interruption|
|US5215448 *||26 Dec 1991||1 Jun 1993||Ingersoll-Dresser Pump Company||Combined boiler feed and condensate pump|
|US5231546||26 Dec 1990||27 Jul 1993||Matsushita Electric Industrial Co., Ltd.||Recording and reproducing apparatus with limited digital copying|
|US5233650||28 Feb 1990||3 Aug 1993||Sun Plan Investments Limited||Telephone support device|
|US5243650||22 Mar 1991||7 Sep 1993||Televerket||Method and apparatus for encryption/decryption of digital multisound in television|
|US5260999||15 Sep 1992||9 Nov 1993||Digital Equipment Corporation||Filters in license management system|
|US5265164||31 Oct 1991||23 Nov 1993||International Business Machines Corporation||Cryptographic facility environment backup/restore and replication in a public key cryptosystem|
|US5289276||19 Jun 1992||22 Feb 1994||General Electric Company||Method and apparatus for conveying compressed video data over a noisy communication channel|
|US5303294||10 Jun 1992||12 Apr 1994||Matsushita Electric Industrial Co., Ltd.||Video theater system and copy preventive method|
|US5315448||18 Mar 1993||24 May 1994||Macrovision Corporation||Copy protection for hybrid digital video tape recording and unprotected source material|
|US5323244||22 Sep 1993||21 Jun 1994||Matsushita Electric Industrial Co., Ltd.||Recording and reproducing apparatus|
|US5377266||21 Jul 1993||27 Dec 1994||Matsushita Electric Industrial Co., Ltd.||Scramble apparatus and descramble apparatus|
|US5381481||4 Aug 1993||10 Jan 1995||Scientific-Atlanta, Inc.||Method and apparatus for uniquely encrypting a plurality of services at a transmission site|
|US5392351||15 Mar 1993||21 Feb 1995||Fujitsu Limited||Electronic data protection system|
|US5406625||12 Nov 1992||11 Apr 1995||Sony Corporation||Receiving apparatus and recording method|
|US5418853||21 Jul 1993||23 May 1995||Sony Corporation||Apparatus and method for preventing unauthorized copying of video signals|
|US5442541||23 Jul 1993||15 Aug 1995||Xerox Corporation||Enabling features over common communication channel|
|US5469272||13 Apr 1994||21 Nov 1995||Sony Corporation||Digital signal recording and/or reproducing apparatus|
|US5477276||14 Dec 1993||19 Dec 1995||Sony Corporation||Digital signal processing apparatus for achieving fade-in and fade-out effects on digital video signals|
|US5504816||2 Feb 1994||2 Apr 1996||Gi Corporation||Method and apparatus for controlling access to digital signals|
|US5506903||5 Apr 1994||9 Apr 1996||Sony Corporation||Digital multiplex transmission system|
|US5513260||29 Jun 1994||30 Apr 1996||Macrovision Corporation||Method and apparatus for copy protection for various recording media|
|US5530756||14 Sep 1994||25 Jun 1996||U.S. Philips Corporation||Television scrambling and descrambling method, and transmitter and receiver using said method|
|US5546461||8 Apr 1994||13 Aug 1996||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|
|US5563946||25 Apr 1994||8 Oct 1996||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|
|US5574787||25 Jul 1994||12 Nov 1996||Ryan; John O.||Apparatus and method for comprehensive copy protection for video platforms and unprotected source material|
|US5576843||29 Oct 1993||19 Nov 1996||Time Warner Entertainment Co., L.P.||System and method for controlling play of multiple dialog audio tracks of a software carrier|
|US5579120||27 Sep 1994||26 Nov 1996||Sony Corporation||Copyright protection for digital signal recording and/or reproduction and recording medium thereof|
|US5588058||29 Mar 1994||24 Dec 1996||U.S. Philips Corporation||Method and device for scrambling and descrambling of a specific television broadcast|
|US5590306||20 Jul 1993||31 Dec 1996||Fuji Photo Film Co., Ltd.||Memory card management system for writing data with usage and recording codes made significant|
|US5629980||23 Nov 1994||13 May 1997||Xerox Corporation||System for controlling the distribution and use of digital works|
|US5638513||7 Jun 1995||10 Jun 1997||Ananda; Mohan||Secure software rental system using continuous asynchronous password verification|
|US5646992||23 Sep 1993||8 Jul 1997||Digital Delivery, Inc.||Assembly, distribution, and use of digital information|
|US5659613||7 Jun 1995||19 Aug 1997||Macrovision Corporation||Method and apparatus for copy protection for various recording media using a video finger print|
|US5673357||14 Feb 1995||30 Sep 1997||Sony Corporation||Video recording, transmitting and reproducing apparatus with concurrent recording and transmitting or multiple dubbing of copy protected video signals|
|US5689559||1 Dec 1995||18 Nov 1997||Lg Electronics Inc.||Copy prevention method and apparatus of a digital magnetic recording/reproducing system|
|US5689561||6 Oct 1995||18 Nov 1997||Pace; Michael||Computer-based trading card system and method|
|US5703859||29 Aug 1996||30 Dec 1997||Sony Corporation||Digital video copy protection system|
|US5715403||23 Nov 1994||3 Feb 1998||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|
|US5757909||22 Nov 1995||26 May 1998||Lg Electronics, Inc.||Illegal view and copy protection method in digital video system and controlling method thereof|
|US5757910||11 Jun 1996||26 May 1998||Goldstar Co., Ltd.||Apparatus for preventing illegal copying of a digital broadcasting signal|
|US5761302||22 Nov 1995||2 Jun 1998||Lg Electronics Inc.||Copy prevention method and apparatus for digital video system|
|US5778064||28 Mar 1996||7 Jul 1998||Sony Corporation||Apparatus and method for processing a high definition video signal|
|US5790664||26 Feb 1996||4 Aug 1998||Network Engineering Software, Inc.||Automated system for management of licensed software|
|US5799081||27 Oct 1995||25 Aug 1998||Lg Electronics Inc.||Illegal view/copy protection method and apparatus for digital broadcasting system|
|US5832084||5 Jan 1996||3 Nov 1998||Lg Electronics, Inc.||Recording method of digital magnetic recording medium for copyright protection and variable speed playback|
|US5862115||9 Apr 1998||19 Jan 1999||Victor Company Of Japan, Ltd.||Method and apparatus for recording an information signal with scrambling thereof|
|US5881038 *||18 Apr 1995||9 Mar 1999||Matsushita Electric Industrial Co., Ltd.||Method and apparatus for preventing illegal copy or illegal installation of information of optical recording medium|
|US5898695||27 Mar 1996||27 Apr 1999||Hitachi, Ltd.||Decoder for compressed and multiplexed video and audio data|
|US5907443||24 Sep 1992||25 May 1999||Canon Kabushiki Kaisha||Recording and reproducing apparatus adapted to selectively control the number of copies made|
|US5910987||4 Dec 1996||8 Jun 1999||Intertrust Technologies Corp.||Systems and methods for secure transaction management and electronic rights protection|
|US5925127||9 Apr 1997||20 Jul 1999||Microsoft Corporation||Method and system for monitoring the use of rented software|
|US5956505||24 Dec 1991||21 Sep 1999||Pitney Bowes Inc.||Remote activation of software features in a data processing device|
|US6009401||6 Apr 1998||28 Dec 1999||Preview Systems, Inc.||Relicensing of electronically purchased software|
|US6028932||1 Apr 1998||22 Feb 2000||Lg Electronics Inc.||Copy prevention method and apparatus for digital video system|
|US6052242||16 Oct 1998||18 Apr 2000||Canon Kabushiki Kaisha||Recording apparatus with copy control based on copies made and allowed to be made|
|US6236971||10 Nov 1997||22 May 2001||Contentguard Holdings, Inc.||System for controlling the distribution and use of digital works using digital tickets|
|US6430290||19 Jan 1999||6 Aug 2002||Koninklijke Philips Electronics N.V.||Conditional access|
|US7069250||15 Oct 2001||27 Jun 2006||Payformance Corporation||Check based online payment and verification system and method|
|US7114745||9 Dec 2003||3 Oct 2006||Trw Automotive Safety Systems Gmbh||Monitoring system for detent connections|
|US20070185814 *||18 Oct 2006||9 Aug 2007||Intertrust Technologies Corporation||Digital rights management engine systems and methods|
|US20070204078 *||19 Oct 2006||30 Aug 2007||Intertrust Technologies Corporation||Digital rights management engine systems and methods|
|US20100067705 *||19 Nov 2009||18 Mar 2010||Intertrust Technologies Corp.||Digital rights management engine systems and methods|
|USRE33189||18 Sep 1989||27 Mar 1990||Communications Satellite Corporation||Security system for SSTV encryption|
|USRE36763||20 May 1997||4 Jul 2000||Sony Corporation||Apparatus and method for preventing unauthorized copying of video signals|
|EP0267039A2||5 Nov 1987||11 May 1988||Satellite Technology Services, Inc.||Video system and method for controlled videotaping|
|EP0498617A2||4 Feb 1992||12 Aug 1992||Matsushita Electric Industrial Co., Ltd.||Digital signal transmitting method|
|EP0519320A2||11 Jun 1992||23 Dec 1992||Matsushita Electric Industrial Co., Ltd.||Video theater system and copy preventive method|
|EP0580367A2||16 Jul 1993||26 Jan 1994||Sony Corporation||Video signal transmission, recording and reproduction|
|EP0581227A2||26 Jul 1993||2 Feb 1994||Hitachi, Ltd.||Apparatus for the recording and/or the reproducing of video signals|
|EP0589459A1||23 Sep 1993||30 Mar 1994||Matsushita Electric Industrial Co., Ltd.||Recording and reproducing apparatus|
|JPH0670282A||Title not available|
|JPH06162690A||Title not available|
|JPH06199288A||Title not available|
|JPH06339110A||Title not available|
|1||Derfler, F. J. et al., "How Networks Work".|
|2||Gralla, P., "How The Internet Works".|
|3||ISO/IEC 13818-1, "Information Technology-Generic Coding of Moving Pictures and Associated Audio: Systems" International Standard, Nov. 13, 1994, 1-144 (all pages).|
|4||ISO/IEC 13818-1, "Information Technology—Generic Coding of Moving Pictures and Associated Audio: Systems" International Standard, Nov. 13, 1994, 1-144 (all pages).|
|5||ISO/IEC, 13818-2, "Information Technology-Generic Coding of Moving Pictures and Associated Audio Information Video", International Standard, 1995, pp. 1-243 (all pages).|
|6||ISO/IEC, 13818-2, "Information Technology—Generic Coding of Moving Pictures and Associated Audio Information Video", International Standard, 1995, pp. 1-243 (all pages).|
|7||Muller, N. J., "Desktop Encyclopedia of the Internet".|
|8||Strunk, Jr. et al., "The Elements of Style", Third Edition, MacMillan Publishing Co., Inc., 59 pages, 1979.|
|9||Systems Working Committee, "MPEG-2 Systems Working Draft", International Organization for Standardization, ISO/IEC/JTC1/SC29/WG11N0601, 114 pages, Nov. 1993.|
|10||Wasilewski, "MPEG-2 systems specification: Blueprint for network interoperability", Communications Technology, 8 pages, Feb. 1994.|
|11||White, R., "How Computers Work".|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US8190529 *||15 Jul 2003||29 May 2012||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|
|US9008308 *||19 Mar 2012||14 Apr 2015||Vixs Systems, Inc||Container agnostic decryption device and methods for use therewith|
|US20050086171 *||15 Jul 2003||21 Apr 2005||Makoto Abe||Information processing system, information communication terminal and method, information processing device and method, recording medium, and program|
|US20120134529 *||31 May 2012||Pedro Javier Vazquez||Method and apparatus for applying of a watermark to a video during download|
|US20120210447 *||16 Aug 2012||Pedro Javier Vazquez||Secure video download method|
|US20130202110 *||19 Mar 2012||8 Aug 2013||Vixs Systems, Inc.||Container agnostic decryption device and methods for use therewith|
|U.S. Classification||380/201, 705/51, 705/52, 705/58, 705/57, 380/228|
|International Classification||G06F21/00, A47L9/26, G09C1/00, G11B20/10, H04L9/00, H04N5/92, G11B20/12, H04L9/32, H04N5/91, H04N5/913|
|Cooperative Classification||H04N9/8042, H04N5/913, H04N2005/91364, H04N9/8063, H04N9/8205, H04N2005/91328|
|20 Sep 2013||REMI||Maintenance fee reminder mailed|
|12 Feb 2014||LAPS||Lapse for failure to pay maintenance fees|