IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0037499
(2002-01-02)
|
발명자
/ 주소 |
- Candelore,Brant L.
- Unger,Robert Allan
- Pedlow, Jr.,Leo M.
|
출원인 / 주소 |
- Sony Corporation
- Sony Electronics Inc.
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
64 인용 특허 :
194 |
초록
▼
An encryption arrangement for multiple encryption of television programs. A system according to embodiments of the present invention multiple encrypts only a portion of the data required for full presentation of a television program to permit coexistence of multiple conditional access encryption sys
An encryption arrangement for multiple encryption of television programs. A system according to embodiments of the present invention multiple encrypts only a portion of the data required for full presentation of a television program to permit coexistence of multiple conditional access encryption systems associated with multiple manufacturer's set-top boxes within a single system. PID mapping techniques are used to distinguish between multiple encryptions. By only encrypting a portion of the program, dramatically less bandwidth is consumed than the alternative of multiple encryption of all program data, thus permitting a larger number of programs to be carried over the same bandwidth while permitting coexistence of multiple conditional access systems in a single cable television system.
대표청구항
▼
What is claimed is: 1. A method of producing an encrypted television signal, comprising: receiving a plurality of encrypted samples of the television program, the samples being encrypted under a first encryption method; receiving a duplicate of the plurality of encrypted samples of the television
What is claimed is: 1. A method of producing an encrypted television signal, comprising: receiving a plurality of encrypted samples of the television program, the samples being encrypted under a first encryption method; receiving a duplicate of the plurality of encrypted samples of the television program, the duplicate of the plurality of encrypted samples being encrypted under a second encryption method; and combining the plurality of encrypted samples and the duplicate of the plurality of encrypted samples with an unencrypted portion to produce the encrypted television signal as an output. 2. The method according to claim 1, wherein the television signal is a digital television signal, and wherein the encrypted samples and the duplicate encrypted samples comprise encrypted packets, and the unencrypted portion comprises unencrypted packets. 3. The method according to claim 2, wherein the digital television signal complies with an MPEG standard, and wherein the encrypted packets are identified by a first and a second packet identifier, wherein the first packet identifier identifies the packets containing the encrypted samples and wherein the second packet identifier identifies the packets containing the duplicate encrypted samples. 4. The method according to claim 2, wherein the digital television signal complies with an MPEG standard, and wherein the unencrypted packets are identified by a first packet identifier, and wherein the encrypted packets containing the first encrypted samples are identified by the first packet identifier, and wherein the packets containing the duplicate encrypted samples are identified by a second packet identifier. 5. The method according to claim 2, wherein the digital television signal complies with an MPEG standard, and wherein the unencrypted packets are identified by a first packet identifier, and wherein the encrypted packets containing the first encrypted samples are identified by a second packet identifier, and wherein the encrypted packets containing the duplicate encrypted samples are identified by a third packet identifier. 6. A method of producing a multiple encrypted television signal, comprising: receiving a plurality of unencrypted packets; receiving a plurality of multiple encrypted packets, wherein the multiple encrypted packets comprise first encrypted packets encrypted under a first encryption method and second encrypted packets are encrypted under a second encryption method, and wherein both the unencrypted and at least one of the first and second encrypted packets are required to decode the television signal; and combining the plurality of unencrypted packets with the plurality of multiple encrypted packets to produce the multiple encrypted television signal as an output. 7. The method according to claim 6, wherein the unencrypted packets and multiple encrypted packets comprise transport stream packets. 8. The method according to claim 6, wherein the television signal complies with an MPEG standard, and wherein the encrypted and unencrypted packets are identified by a packet identifier. 9. The method according to claim 6, wherein the digital television complies with an MPEG standard, and wherein the unencrypted packets and the first encrypted packets are identified by a primary packet identifier, and wherein the second encrypted packets are identified by a secondary packet identifier. 10. A method of encrypting content, comprising: identifying a portion of the content to encrypt according to a selection algorithm where less than 100% of the content is encrypted; encrypting the identified content portion according to a first encryption method to produce a first encrypted content portion; encrypting the identified content portion according to a second encryption method to produce a second encrypted content portion; and combining an unencrypted content portion along with the first and second encrypted content portions to produce partially multiple encrypted content. 11. The method according to claim 10, wherein the content comprises a digital video signal. 12. The method according to claim 10, further comprising distributing the unencrypted content portion along with the first and second encrypted content portions. 13. The method according to claim 10, wherein the content comprises a television signal and the partially multiple encrypted content comprises a partially multiple encrypted television signal. 14. The method according to claim 13, further comprising distributing the partially multiple encrypted television signal over one of the following: a cable system, a terrestrial broadcast system, satellite system, and as packaged media. 15. The method according to claim 13, wherein the television signal has an audio portion, a video portion and a system information portion. 16. The method according to claim 15, wherein the selection algorithm comprises selecting system information for encrypting. 17. The method according to claim 15, wherein the selection algorithm comprises selecting the audio portion for encrypting. 18. The method according to claim 15, wherein the selection algorithm comprises selecting the video portion for encrypting. 19. The method according to claim 10, wherein the content is comprised of multiple programs and wherein the selection algorithm comprises sequentially selecting each program for a period of time for encryption. 20. The method according to claim 10, wherein the content is comprised of multiple programs and wherein the selection algorithm comprises selecting fewer than 100% of the programs for a period of time for encryption. 21. The method according to claim 10, wherein the content is comprised of blocks of data and wherein the selection algorithm comprises selecting N blocks for every Mth block of content for encryption, where N is less than M. 22. The method according to claim 10, wherein the content is comprised of data structures and wherein the selection algorithm comprises selecting a fraction of the data structures for encrypting. 23. The method according to claim 10, wherein the content is comprised of compressed data, wherein the algorithm comprises selection of data needed for decompressing the content for encrypting. 24. The method according to claim 10, wherein the content is comprised of a plurality of packetized elementary streams with the packets containing header information, and wherein the algorithm comprises selecting header information for encrypting. 25. The method according to claim 24, wherein the header information comprises at least one of packetized elementary stream (PES) header, sequence header, sequence header extension, and group of pictures (GOP) header. 26. The method according to claim 10, wherein the content is packetized using a first packet identifier (PID), and the PID for packets containing content selected for encryption is mapped to a second PID. 27. The method according to claim 10, further comprising distributing the unencrypted content portion separately from the first and second encrypted content portions. 28. An electronic storage medium storing instructions which, when executed on a programmed processor, carry out the method of encrypting content according to claim 10. 29. A method of encrypting digital audio and video content, comprising: encrypting the digital audio and video content according to a first encryption method and a second encryption method to produce a first encrypted digital audio and video content portion and a second encrypted digital audio and video portion, respectively; and combining the first encrypted digital audio and video content portion and the second encrypted digital audio and video content portion with an unencrypted digital audio and video content portion to produce an output signal of multiple partially encrypted digital audio and video content. 30. The method according to claim 29, wherein the multiple partially encrypted content comprises a television signal. 31. The method according to claim 30, wherein the multiple partially encrypted television signal is distributed over one of the following: a cable system, a terrestrial broadcast system, satellite system, and as packaged media. 32. A method of managing multiple access control systems with an audio visual content distribution system, comprising: identifying a portion of the content to replicate for each of a plurality of access control systems according to a selection algorithm wherein less than 100% of the content is replicated and wherein the portion that is not identified for replication is an unencrypted portion; and replicating the identified portion twice to create a first replicated identified portion and a second replicated identified portion; and providing an output signal comprising the first replicated portion and the second replicated portion. 33. The method according to claim 32, further comprising encrypting the first replicated identified portion using a first encryption algorithm. 34. The method according to claim 33, further comprising: encrypting the second replicated identified portion using a second encryption algorithm. 35. The method according to claim 34, further comprising combining the unencrypted portion with the encrypted first replicated portion and the encrypted second replicated portion to produce multiple partially encrypted content. 36. The method according to claim 35, wherein the multiple partially encrypted content is distributed over one of the following: a cable system, a terrestrial broadcast system, satellite system, and as packaged media. 37. The method according to claim 35, further comprising assigning a separate packet identifier (PID) to packets containing each of the unencrypted content, the encrypted first replicated identified portion and the encrypted second replicated portion. 38. The method according to claim 32, wherein the content comprises television content. 39. An apparatus for generating a multiple encrypted packetized digital television signal, comprising: means for receiving a first plurality of unencrypted packets; a first encryptor for encryption of a second plurality of packets encrypted under a first encryption method; a second encryptor for encryption of a third plurality packets encrypted under a second encryption method; and wherein the packets encrypted under the first and second encryption methods are duplicate packets, and wherein the packets are selected for encryption using a selection criterion; and a multiplexer that combines the first, second and third plurality of packets into a transport data stream as an output thereof. 40. The apparatus for generating the multiple encrypted packetized digital television signal according to claim 39, wherein the digital television signal comprises an MPEG compliant digital television signal. 41. The apparatus for generating the multiple encrypted packetized digital television signal according to claim 40, wherein the first plurality of unencrypted packets and the second plurality of encrypted packets are identified by a first packet identifier. 42. The apparatus for generating the multiple encrypted packetized digital television signal according to claim 41, wherein the second plurality of encrypted packets are identified by a second packet identifier.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.