CA2406329A1 - Decoding and decryption of partially encrypted information - Google Patents
Decoding and decryption of partially encrypted information Download PDFInfo
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- CA2406329A1 CA2406329A1 CA 2406329 CA2406329A CA2406329A1 CA 2406329 A1 CA2406329 A1 CA 2406329A1 CA 2406329 CA2406329 CA 2406329 CA 2406329 A CA2406329 A CA 2406329A CA 2406329 A1 CA2406329 A1 CA 2406329A1
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- packets
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- packet identifier
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Abstract
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. 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.
Claims (81)
1. A method of decoding partially encrypted content, comprising:
receiving partially encrypted content comprising unencrypted content, first content encrypted under a first encryption system and second content encrypted under a second encryption system;
decrypting the second encrypted content; and decoding the clear first content and the decrypted second content to decode the partially encrypted content.
receiving partially encrypted content comprising unencrypted content, first content encrypted under a first encryption system and second content encrypted under a second encryption system;
decrypting the second encrypted content; and decoding the clear first content and the decrypted second content to decode the partially encrypted content.
2. The method according to claim 1, wherein the receiving, decrypting and decoding are carried out in a television device.
3. The method according to claim 2, wherein the television device comprises a television set-top box.
4. The method according to claim 1, wherein the receiving, decrypting and decoding are carried out in an integrated circuit.
5. The method according to claim 1, wherein the receiving, decrypting and decoding are carried out in one of an application specific integrated circuit and a field programmable gate array.
6. A method of decoding a partially encrypted television signal, comprising:
receiving a message identifying a primary packet identifier (PID) for a program and a secondary PID for the program;
decrypting packets having the secondary PID; and combining the decrypted packets with packets having the primary PID to form a data stream representing the program.
receiving a message identifying a primary packet identifier (PID) for a program and a secondary PID for the program;
decrypting packets having the secondary PID; and combining the decrypted packets with packets having the primary PID to form a data stream representing the program.
7. The method according to claim 6, further comprising decoding the decrypted packets and the packets having the primary PID.
8. The method according to claim 6, further comprising mapping the decrypted packets to the primary PID.
9. The method according to claim 8, wherein the mapping is carried out in an integrated circuit device.
10. The method according to claim 8, wherein the mapping is carried out in one of an application specific integrated circuit device and a field programmable gate array.
11. The method according to claim 6, wherein packets having the primary PID
comprise unencrypted packets and encrypted packets and further comprising:
receiving encrypted packets having the primary PID; and discarding the encrypted packets having the primary PID.
comprise unencrypted packets and encrypted packets and further comprising:
receiving encrypted packets having the primary PID; and discarding the encrypted packets having the primary PID.
12. The method according to claim 6, carried out in a television device.
13. The method according to claim 6, carried out in a television set-top box.
14. A method of decoding partially encrypted television program, comprising:
identifying a television program by packets associated with a primary packet identifier and a secondary packet identifier;
decrypting packets having the secondary packet identifier.
identifying a television program by packets associated with a primary packet identifier and a secondary packet identifier;
decrypting packets having the secondary packet identifier.
15. The method according to claim 14, further comprising decoding the decrypted packets having the secondary packet identifier along with packets having the primary packet identifier to decode the partially encrypted television program.
16. The method according to claim 14 further comprising discarding encrypted packets having the primary packet identifier.
17. The method according to claim 14, wherein certain of the packets associated with the primary packet identifier are encrypted according to a first encryption method, and wherein the packets having a secondary packet identifier are encrypted according to a second encryption method.
18. The method according to claim 14, wherein the encrypted packets comprise transport stream packets carrying an MPEG packetized elementary stream (PES) header as a portion of a payload thereof.
19. The method according to claim 14, wherein the encrypted packets comprise audio packets.
20. The method according to claim 14, wherein the encrypted packets comprise time sliced samples of the television program.
21. The method according to claim 14, wherein the encrypted packets comprise packets critical to decoding the television program.
22. The method according to claim 14, wherein the television program is compressed and wherein the encrypted packets comprise packets critical to decompression of the television program.
23. The method according to claim 14, wherein the encrypted packets comprise N packets out of every M packets where N is less than M.
24. The method according to claim 14, further comprising remapping packets having the secondary packet identifier to have the primary packet identifier.
25. An electronic storage medium storing instructions which, when executed on a programmed processor, carry out the method of decoding a television program according to claim 14.
26. An electronic transmission medium carrying a sequence of instructions for carrying out a method of decoding a television program by the method according to claim 14.
27. A television device, comprising:
means for receiving a partially encrypted television program, the television program being identified by packets associated with either a primary packet identifier or a secondary packet identifier;
a decrypter that decrypts packets having the secondary packet identifier; and a decoder that decodes the decrypted packets having the secondary packet identifier along with packets having the primary packet identifier to decode the partially encrypted television program.
means for receiving a partially encrypted television program, the television program being identified by packets associated with either a primary packet identifier or a secondary packet identifier;
a decrypter that decrypts packets having the secondary packet identifier; and a decoder that decodes the decrypted packets having the secondary packet identifier along with packets having the primary packet identifier to decode the partially encrypted television program.
28. The apparatus according to claim 27, further comprising means for discarding encrypted packets having the primary packet identifier.
29. The apparatus according to claim 27, wherein certain of the packets associated with the primary packet identifier are encrypted according to a first encryption method, and wherein the packets having a secondary packet identifier are encrypted according to a second encryption method.
30. The apparatus according to claim 27, wherein the encrypted packets comprise transport stream packets carrying an MPEG packetized elementary stream (PES) header as a portion of a payload thereof.
31. The apparatus according to claim 27, wherein the encrypted packets comprise audio packets.
32. The apparatus according to claim 27, wherein the encrypted packets comprise video packets.
33. The apparatus according to claim 27, wherein the encrypted packets comprise time sliced samples of the television program.
34. The apparatus according to claim 27, wherein the television device comprises a television set-top box.
35. A content player, comprising:
means for receiving partially encrypted audio visual content, the content being identified by packets associated with either a primary packet identifier or a secondary packet identifier;
a decrypter that decrypts packets having the secondary packet identifier; and a decoder that decodes the decrypted packets having the secondary packet identifier along with packets having the primary packet identifier to decode the partially encrypted audio visual content.
means for receiving partially encrypted audio visual content, the content being identified by packets associated with either a primary packet identifier or a secondary packet identifier;
a decrypter that decrypts packets having the secondary packet identifier; and a decoder that decodes the decrypted packets having the secondary packet identifier along with packets having the primary packet identifier to decode the partially encrypted audio visual content.
36. The apparatus according to claim 35, further comprising means for discarding encrypted packets having the primary packet identifier.
37. The apparatus according to claim 35, wherein certain of the packets associated with the primary packet identifier are encrypted according to a first encryption method, and wherein the packets having a secondary packet identifier are encrypted according to a second encryption method.
38. The apparatus according to claim 35, wherein the encrypted packets comprise transport stream packets carrying an MPEG packetized elementary stream (PES) header as a portion of a payload thereof.
39. The apparatus according to claim 35, wherein the encrypted packets comprise audio packets.
40. The apparatus according to claim 35, wherein the encrypted packets comprise video packets.
41. The apparatus according to claim 35, wherein the encrypted packets comprise time sliced samples of the television program.
42. The apparatus according to claim 35, wherein content player comprises one of a television device, a PDA, a music player and a personal computer.
43. A television set-top box, comprising:
a receiver that receives:
a plurality of unencrypted elementary stream packets; and a plurality of encrypted packets, wherein both the unencrypted are required to decode a television program;
a decrypter that decrypts the encrypted packets; and a decoder that decodes the packets to produce a television signal.
a receiver that receives:
a plurality of unencrypted elementary stream packets; and a plurality of encrypted packets, wherein both the unencrypted are required to decode a television program;
a decrypter that decrypts the encrypted packets; and a decoder that decodes the packets to produce a television signal.
44. The apparatus according to claim 43, wherein the encrypted packets comprise encrypted elementary stream packets.
45. The apparatus according to claim 43, wherein the unencrypted packets and encrypted packets comprise transport stream packets.
46. The apparatus according to claim 43, wherein the encrypted packets comprise system information packets.
47. The apparatus according to claim 43, wherein the encrypted and unencrypted packets are identified by a packet identifier.
48. The apparatus according to claim 47, wherein the unencrypted packets are identified by a primary packet identifier, and wherein the encrypted packets are identified by a secondary packet identifier.
49. A circuit, comprising:
an input that receives an input stream of packets, the input stream of packets comprising:
unencrypted packets having a first packet identifier, encrypted packets having the first packet identifier, encrypted packets having a second packet identifier, a packet identifier reader that reads the packet identifiers of the packets in the input stream of packets, and that discards the encrypted packets having the first packet identifier;
a packet identifier re-mapping circuit that re-maps the second packet identifier to the first packet identifier to produce re-mapped packets; and a multiplexer that multiplexes the re-mapped packets with the unencrypted packets having the first packet identifier to produce an output stream of packets.
an input that receives an input stream of packets, the input stream of packets comprising:
unencrypted packets having a first packet identifier, encrypted packets having the first packet identifier, encrypted packets having a second packet identifier, a packet identifier reader that reads the packet identifiers of the packets in the input stream of packets, and that discards the encrypted packets having the first packet identifier;
a packet identifier re-mapping circuit that re-maps the second packet identifier to the first packet identifier to produce re-mapped packets; and a multiplexer that multiplexes the re-mapped packets with the unencrypted packets having the first packet identifier to produce an output stream of packets.
50. The apparatus according to claim 49, wherein the encrypted packets having the first packet identifier are encrypted according to a first encryption technique;
and wherein the encrypted packets having the second packet identifier are encrypted according to a second encryption technique.
and wherein the encrypted packets having the second packet identifier are encrypted according to a second encryption technique.
51. The apparatus according to claim 49, further comprising an MPEG decoder receiving the output stream of packets.
52. The apparatus according to claim 49, wherein the circuit is embodied in an integrated circuit.
53. The apparatus according to claim 49, wherein the circuit is embodied in one of a field programmable gate array, a programmable logic device and an application specific integrated circuit.
54. The apparatus according to claim 49, further comprising a demultiplexer that demultiplexes the output stream of packets based upon the packet identifiers.
55. A circuit, comprising:
input means for receiving an input stream of packets, the input stream of packets comprising:
unencrypted packets having a first packet identifier, encrypted packets having the first packet identifier, encrypted packets having a second packet identifier, packet identifier reading means for reading the packet identifiers of the packets in the input stream of packets, and for discarding the encrypted packets having the first packet identifier;
packet identifier re-mapping means for re-mapping the second packet identifier to the first packet identifier to produce re-mapped packets; and multiplexer means for multiplexing the re-mapped packets with the unencrypted packets having the first packet identifier to produce an output stream of packets.
input means for receiving an input stream of packets, the input stream of packets comprising:
unencrypted packets having a first packet identifier, encrypted packets having the first packet identifier, encrypted packets having a second packet identifier, packet identifier reading means for reading the packet identifiers of the packets in the input stream of packets, and for discarding the encrypted packets having the first packet identifier;
packet identifier re-mapping means for re-mapping the second packet identifier to the first packet identifier to produce re-mapped packets; and multiplexer means for multiplexing the re-mapped packets with the unencrypted packets having the first packet identifier to produce an output stream of packets.
56. The apparatus according to claim 55, wherein the encrypted packets having the first packet identifier are encrypted according to a first encryption technique;
and wherein the encrypted packets having the second packet identifier are encrypted according to a second encryption technique.
and wherein the encrypted packets having the second packet identifier are encrypted according to a second encryption technique.
57. The apparatus according to claim 55, further comprising an MPEG decoder receiving the output stream of packets.
58. The apparatus according to claim 55, wherein the circuit is embodied in an integrated circuit.
59. The apparatus according to claim 55, wherein the circuit is embodied in one of a field programmable gate array, an application specific integrated circuit and an application specific integrated circuit.
60. The apparatus according to claim 55, further comprising a demultiplexer that demultiplexes the output stream of packets based upon the packet identifiers.
61. A method of processing packets, comprising:
receiving an input stream of packets, the input stream of packets comprising:
unencrypted packets having a first packet identifier, encrypted packets having the first packet identifier, encrypted packets having a second packet identifier, reading the packet identifiers of the packets in the input stream of packets;
discarding the encrypted packets having the first packet identifier;
re-mapping the second packet identifier to the first packet identifier to produce re-mapped packets; and multiplexing the re-mapped packets with the unencrypted packets having the first packet identifier to produce an output stream of packets.
receiving an input stream of packets, the input stream of packets comprising:
unencrypted packets having a first packet identifier, encrypted packets having the first packet identifier, encrypted packets having a second packet identifier, reading the packet identifiers of the packets in the input stream of packets;
discarding the encrypted packets having the first packet identifier;
re-mapping the second packet identifier to the first packet identifier to produce re-mapped packets; and multiplexing the re-mapped packets with the unencrypted packets having the first packet identifier to produce an output stream of packets.
62. The method according to claim 61, wherein the encrypted packets having the first packet identifier are encrypted according to a first encryption technique;
and wherein the encrypted packets having the second packet identifier are encrypted according to a second encryption technique.
and wherein the encrypted packets having the second packet identifier are encrypted according to a second encryption technique.
63. The method according to claim 61, carried out in an integrated circuit.
64. The method according to claim 61, carried out in one of a field programmable gate array, a programmable logic device and an application specific integrated circuit.
65. The method according to claim 61, carried out in a main central processor of a television set-top box.
66. The method according to claim 61, carried out in a decoder circuit of a television set-top box.
67. The method according to claim 61, further comprising demultiplexing the output stream of packets based upon the packet identifiers.
68. A method of processing packets, comprising:
receiving an input stream of packets, the input stream of packets comprising:
unencrypted packets having a first packet identifier, encrypted packets having the first packet identifier, encrypted packets having a second packet identifier, reading the packet identifiers of the packets in the input stream of packets;
discarding the encrypted packets having the first packet identifier; and re-mapping packets that have not been discarded so that they have the same packet identifier.
receiving an input stream of packets, the input stream of packets comprising:
unencrypted packets having a first packet identifier, encrypted packets having the first packet identifier, encrypted packets having a second packet identifier, reading the packet identifiers of the packets in the input stream of packets;
discarding the encrypted packets having the first packet identifier; and re-mapping packets that have not been discarded so that they have the same packet identifier.
69. The method according to claim 68, further comprising multiplexing the packets that have not been discarded with each other to produce an output stream of packets.
70. The method according to claim 68, wherein the encrypted packets having the first packet identifier are encrypted according to a first encryption technique;
and wherein the encrypted packets having the second packet identifier are encrypted according to a second encryption technique.
and wherein the encrypted packets having the second packet identifier are encrypted according to a second encryption technique.
71. The method according to claim 68, carried out in an integrated circuit.
72. The method according to claim 68, carried out in one of a field programmable gate array, a programmable logic device and an application specific integrated circuit.
73. The method according to claim 68, carried out in a main central processor of a television set-top box.
74. The method according to claim 68, carried out in a decoder circuit of a television set-top box.
75. The method according to claim 68, further comprising demultiplexing the output stream of packets based upon the packet identifiers.
76. A circuit, comprising:
an input that receives an input stream of packets, the input stream of packets comprising:
unencrypted packets having a first packet identifier, encrypted packets having the first packet identifier, encrypted packets having a second packet identifier, a packet identifier reader that reads the packet identifiers of the packets in the input stream of packets, and that discards the encrypted packets having the first packet identifier; and a packet identifier re-mapping circuit that re-maps at least one of the second packet identifier and the first packet identifier so that the packets that have not been discarded have the same packet identifier.
an input that receives an input stream of packets, the input stream of packets comprising:
unencrypted packets having a first packet identifier, encrypted packets having the first packet identifier, encrypted packets having a second packet identifier, a packet identifier reader that reads the packet identifiers of the packets in the input stream of packets, and that discards the encrypted packets having the first packet identifier; and a packet identifier re-mapping circuit that re-maps at least one of the second packet identifier and the first packet identifier so that the packets that have not been discarded have the same packet identifier.
77. The apparatus according to claim 76, further comprising a multiplexer that multiplexes the re-mapped packets with the unencrypted packets having the first packet identifier to produce an output stream of packets.
78. The apparatus according to claim 76, wherein the encrypted packets having the first packet identifier are encrypted according to a first encryption technique;
and wherein the encrypted packets having the second packet identifier are encrypted according to a second encryption technique.
and wherein the encrypted packets having the second packet identifier are encrypted according to a second encryption technique.
79. The apparatus according to claim 76, further comprising an MPEG decoder receiving the output stream of packets.
80. The apparatus according to claim 76, wherein the circuit is embodied in an integrated circuit.
81. The apparatus according to claim 76, wherein the circuit is embodied in one of a field programmable gate array, a programmable logic device and an application specific integrated circuit.
Priority Applications (11)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020047010483A KR100952799B1 (en) | 2002-01-02 | 2002-12-13 | Decoding and decryption of partially encrypted information |
| EP11154828.5A EP2315440B1 (en) | 2002-01-02 | 2002-12-13 | Television apparatus and circuit |
| CNB028284488A CN100435580C (en) | 2002-01-02 | 2002-12-13 | Decoding and decryption of partially encrypted information |
| KR1020097003356A KR100943131B1 (en) | 2002-01-02 | 2002-12-13 | Decoding and decryption of partially encrypted information |
| JP2003565173A JP4557549B2 (en) | 2002-01-02 | 2002-12-13 | Decryption and decoding of partially encrypted data |
| KR1020097022281A KR100989015B1 (en) | 2002-01-02 | 2002-12-13 | Decoding and decryption of partially encrypted information |
| MXPA04006442A MXPA04006442A (en) | 2002-01-02 | 2002-12-13 | Decoding and decryption of partially encrypted information. |
| PCT/US2002/040045 WO2003065724A1 (en) | 2002-01-02 | 2002-12-13 | Decoding and decryption of partially encrypted information |
| EP02806702.3A EP1461950B1 (en) | 2002-01-02 | 2002-12-13 | Decoding and decryption of partially encrypted information |
| JP2009273466A JP5161862B2 (en) | 2002-01-02 | 2009-12-01 | Decryption and decoding of partially encrypted data |
| HK11111513.2A HK1157538A1 (en) | 2001-10-26 | 2011-10-26 | Television apparatus and circuit |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US34371001P | 2001-10-26 | 2001-10-26 | |
| US60/343,710 | 2001-10-26 | ||
| US10/037,498 US7127619B2 (en) | 2001-06-06 | 2002-01-02 | Decoding and decryption of partially encrypted information |
| US10/037,498 | 2002-01-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2406329A1 true CA2406329A1 (en) | 2003-04-26 |
| CA2406329C CA2406329C (en) | 2011-08-09 |
Family
ID=26714188
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2406329 Expired - Lifetime CA2406329C (en) | 2001-10-26 | 2002-10-01 | Decoding and decryption of partially encrypted information |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2406329C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115937441A (en) * | 2022-11-08 | 2023-04-07 | 泰瑞数创科技(北京)股份有限公司 | Three-dimensional collaborative plotting method and system under low-bandwidth environment |
-
2002
- 2002-10-01 CA CA 2406329 patent/CA2406329C/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115937441A (en) * | 2022-11-08 | 2023-04-07 | 泰瑞数创科技(北京)股份有限公司 | Three-dimensional collaborative plotting method and system under low-bandwidth environment |
| CN115937441B (en) * | 2022-11-08 | 2023-09-05 | 泰瑞数创科技(北京)股份有限公司 | Three-dimensional collaborative plotting method and system in low-bandwidth environment |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2406329C (en) | 2011-08-09 |
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| Date | Code | Title | Description |
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| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20221003 |