CA2405865A1 - Elementary stream partial encryption - Google Patents
Elementary stream partial encryption Download PDFInfo
- Publication number
- CA2405865A1 CA2405865A1 CA 2405865 CA2405865A CA2405865A1 CA 2405865 A1 CA2405865 A1 CA 2405865A1 CA 2405865 CA2405865 CA 2405865 CA 2405865 A CA2405865 A CA 2405865A CA 2405865 A1 CA2405865 A1 CA 2405865A1
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- Canada
- Prior art keywords
- encrypted
- television signal
- packets
- encrypting
- pid
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
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. In one embodiment, only audio data are encrypted leaving video in the clear. 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.
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. In one embodiment, only audio data are encrypted leaving video in the clear. 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 (82)
1. A method of encrypting a television signal, comprising:
encrypting an audio portion of the television signal according to a first encryption method to produce a first encrypted audio portion and according to a second encryption method to produce a second encrypted audio portion; and combining an unencrypted video portion of the television signal with the first and second encrypted audio portion.
encrypting an audio portion of the television signal according to a first encryption method to produce a first encrypted audio portion and according to a second encryption method to produce a second encrypted audio portion; and combining an unencrypted video portion of the television signal with the first and second encrypted audio portion.
2. The method according to claim 1, wherein the television signal is a digital television signal, and wherein the encrypting comprises encrypting packets identified as audio packets.
3. The method according to claim 2, wherein the digital television signal complies with an MPEG standard, and wherein the audio packets are identified for encryption by a packet identifier (PID).
4. The method according to claim 2, wherein the digital television signal complies with a digital satellite service (DSS) transport standard, and wherein the audio packets are identified for encryption by a service channel identifier (SCID).
5. The method according to claim 2, wherein audio packets encrypted according to the first encryption method are assigned a first packet identifier and audio packets encrypted according to the second encryption method are assigned a second packet identifier.
6. The method according to claim 5, wherein the first packet identifier and the second packet identifier are referenced as primary elementary PIDs in a program map table (PMT).
7. The method according to claim 5, wherein the first packet identifier is referenced as a primary elementary PID in a program map table (PMT) and the second packet identifier is referenced as a secondary elementary PID in the program map table (PMT).
8. The method according to claim 5, wherein the first encrypted audio portion and the second encrypted audio portion are distributed over one of a terrestrial broadcast system, a satellite system and a cable system.
9. The method according to claim 8, further comprising distributing system information to provide locating information used to locate the first and second encrypted audio portions.
10. The method according to claim 9, further comprising encrypting the system information.
11. An electronic storage medium storing instructions which, when executed on a programmed processor, carry out the method of encrypting a television signal according to claim 1.
12. An electronic transmission medium carrying an encrypted television signal encrypted by the method according to claim 1.
13. A method of encrypting a television signal, comprising:
encrypting an audio portion of the television signal according to a first encryption method to produce a first encrypted audio portion; and combining the first encrypted audio portion with an unencrypted video portion of the television signal to produce a partially encrypted television signal.
encrypting an audio portion of the television signal according to a first encryption method to produce a first encrypted audio portion; and combining the first encrypted audio portion with an unencrypted video portion of the television signal to produce a partially encrypted television signal.
14. The method according to claim 13, wherein the television signal is a digital television signal, and wherein the encrypting comprises encrypting packets identified as audio packets.
15. The method according to claim 14, wherein the digital television signal complies with an MPEG standard, and wherein the audio packets are identified for encryption by a packet identifier (PID).
16. The method according to claim 13, further comprising distributing the partially encrypted television signal over one of a cable system and a satellite system.
17. The method according to claim 16, further comprising transmitting system information to provide locating information used to locate the first encrypted audio portion.
18. The method according to claim 17, further comprising encrypting the system information.
19. The method according to claim 13, further comprising partially encrypting the unencrypted video portion of the television signal.
20. An electronic storage medium storing instructions which, when executed on a programmed processor, carry out the method of encrypting a television signal according to claim 13.
21. An electronic transmission medium carrying an encrypted television signal encrypted by the method according to claim 13.
22. An encrypted television signal for encrypting a television signal having a clear audio portion and a clear video portion, comprising:
a first encrypted audio portion, comprising the clear audio portion encrypted under a first encryption method;
a second encrypted audio portion, comprising the clear audio portion encrypted under a second encryption method; and an unencrypted video portion.
a first encrypted audio portion, comprising the clear audio portion encrypted under a first encryption method;
a second encrypted audio portion, comprising the clear audio portion encrypted under a second encryption method; and an unencrypted video portion.
23. The encrypted television signal according to claim 22, wherein the television signal is a digital television signal, and wherein the first and second encrypted audio portions comprise encrypted packets identified as audio packets.
24. The encrypted television signal according to claim 23, wherein the digital television signal complies with an MPEG standard, and wherein the first encrypted audio portion is comprised of packets identified by a first packet identifier (PID), and wherein the second encrypted audio portion is comprised of packets identified by a second packet identifier (PID).
25. An encrypted television signal for encrypting a television signal having a clear audio portion and a clear video portion, comprising:
a first encrypted audio portion, comprising the clear audio portion encrypted under a first encryption method; and an unencrypted video portion.
a first encrypted audio portion, comprising the clear audio portion encrypted under a first encryption method; and an unencrypted video portion.
26. The encrypted television signal according to claim 25, wherein the television signal is a digital television signal, and wherein the first encrypted audio portion comprises encrypted packets identified as audio packets.
27. The encrypted television signal according to claim 26, wherein the digital television signal complies with an MPEG standard, and wherein the first encrypted audio portion is comprised of packets identified by a first packet identifier (PID).
28. A television set-top box, comprising:
a receiver receiving a dual partially encrypted television program;
a decrypter that receives encrypted audio packets from the receiver and decrypts the encrypted audio packets, the encrypted audio packets being encrypted under a first encryption algorithm; and a decoder that receives and decodes the decrypted audio packets, and that receives and decodes unencrypted video packets to produce a television signal suitable for play on a television receiver.
a receiver receiving a dual partially encrypted television program;
a decrypter that receives encrypted audio packets from the receiver and decrypts the encrypted audio packets, the encrypted audio packets being encrypted under a first encryption algorithm; and a decoder that receives and decodes the decrypted audio packets, and that receives and decodes unencrypted video packets to produce a television signal suitable for play on a television receiver.
29. The apparatus according to claim 26, wherein the receiver further receives and discards audio packets encrypted under a second encryption algorithm.
30. A cable system headend, comprising:
a first encryption system that encrypts audio packets using a first encryption algorithm;
a second encryption system that encrypts audio packets using a second encryption algorithm; and means for distributing a stream of packets over a cable television system, the stream of packets comprising a video packets, audio packets encrypted under the first encryption algorithm, and audio packets encrypted under the second encryption algorithm and system information packets.
a first encryption system that encrypts audio packets using a first encryption algorithm;
a second encryption system that encrypts audio packets using a second encryption algorithm; and means for distributing a stream of packets over a cable television system, the stream of packets comprising a video packets, audio packets encrypted under the first encryption algorithm, and audio packets encrypted under the second encryption algorithm and system information packets.
31. The apparatus according to claim 30, wherein the video packets are unencrypted.
32. The apparatus according to claim 30, wherein the system information packets are unencrypted.
33. The apparatus according to claim 30, wherein the video packets are partially encrypted.
34. The apparatus according to claim 30, wherein the system information packets are encrypted.
35. A method of decoding a partially encrypted television signal, comprising:
receiving a television signal having an encrypted audio portion and a clear video portion;
decrypting the encrypted audio portion to produce a decrypted audio portion;
decoding the decrypted audio portion and the clear video portion to produce a decoded television signal.
receiving a television signal having an encrypted audio portion and a clear video portion;
decrypting the encrypted audio portion to produce a decrypted audio portion;
decoding the decrypted audio portion and the clear video portion to produce a decoded television signal.
36. The method according to claim 35, wherein the decoded signal is suitable for play on a television set.
37. The method according to claim 35, wherein the encrypted audio portion is identified by a packet identifier (PID) associated with a decryption algorithm used for decrypting the encrypted audio portion.
38. The method according to claim 35, wherein the television signal further comprises a second encrypted audio portion; and wherein the encrypted audio portion and the second encrypted audio portions are encrypted using two different encryption algorithms.
39. The method according to claim 38, wherein the encrypted audio portion is identified by a first packet identifier (PID) associated with a decryption algorithm used for decrypting the encrypted audio portion; and wherein the second encrypted audio portion is identified by a second packet identifier (PID) associated with a decryption algorithm used for decrypting the encrypted audio portion.
40. The method according to claim 39, wherein the first PID is a secondary PID
and wherein the second PID is a primary PID.
and wherein the second PID is a primary PID.
41. The method according to claim 39, wherein the first PID is a primary PID
and wherein the second PID is a secondary PID.
and wherein the second PID is a secondary PID.
42. The method according to claim 35, carried out in an integrated circuit.
43. The method according to claim 35, carried out in an application specific integrated circuit.
44. The method according to claim 35, carried out in a television device.
45. The method according to claim 35, carried out in a television set-top box.
46. A method of decoding a partially encrypted television signal, comprising:
receiving a television signal having a first encrypted audio portion, a second encrypted audio portion and a clear video portion, the first audio portion being identified by a first packet identifier (PID), and the second audio portion being identified by a second PID;
discarding the second encrypted audio portion by PID filtering;
decrypting the first encrypted audio portion to produce a decrypted audio portion; and decoding the decrypted audio portion and the clear video portion to produce a decoded signal.
receiving a television signal having a first encrypted audio portion, a second encrypted audio portion and a clear video portion, the first audio portion being identified by a first packet identifier (PID), and the second audio portion being identified by a second PID;
discarding the second encrypted audio portion by PID filtering;
decrypting the first encrypted audio portion to produce a decrypted audio portion; and decoding the decrypted audio portion and the clear video portion to produce a decoded signal.
47. The method according to claim 46, wherein the decoded signal is suitable for play on a television set.
48. The method according to claim 46, wherein the first PID is a secondary PID
and wherein the second PID is a primary PID.
and wherein the second PID is a primary PID.
49. The method according to claim 46, wherein the first PID is a primary PID
and wherein the second PID is a secondary PID.
and wherein the second PID is a secondary PID.
50. The method according to claim 46, carried out in an integrated circuit.
51. The method according to claim 46, carried out in an application specific integrated circuit.
52. The method according to claim 46, carried out in a television device.
53. The method according to claim 46, carried out in a television set-top box.
54. A method of encrypting a digital television signal, wherein the television signal includes an elementary data stream and system information (SI), comprising:
encrypting the SI under a first encryption system;
forming a partially encrypted digital television signal comprising:
the elementary data stream in an unencrypted form; and the SI encrypted under the first encryption system.
encrypting the SI under a first encryption system;
forming a partially encrypted digital television signal comprising:
the elementary data stream in an unencrypted form; and the SI encrypted under the first encryption system.
55. The method according to claim 54, further comprising encrypting the SI
under a second encryption system.
under a second encryption system.
56. The method according to claim 55, wherein the partially encrypted digital television signal further comprises the SI encrypted under the second encryption system.
57. The method according to claim 54, further comprising distributing the partially encrypted television signal over one of the following: a cable system, a terrestrial broadcast system and satellite system.
58. The method according to claim 57, wherein the encrypted SI information is distributed in a different band than that used to distribute the elementary data stream in the unencrypted form.
59. The method according to claim 54, further comprising distributing the partially encrypted television signal over one of the following: a cable system, a terrestrial broadcast system and satellite system.
60. The method according to claim 59, wherein the encrypted SI information is distributed in a different band than that used to distribute the elementary data stream in the unencrypted form.
61. An electronic storage medium storing instructions which, when executed on a programmed processor, carry out the method of encrypting a digital television signal according to claim 54.
62. An electronic transmission medium carrying an encrypted digital television signal encrypted by the method according to claim 54.
63. A partially encrypted digital television signal, comprising:
an unencrypted elementary data stream; and system information (SI) encrypted under a first encryption system.
an unencrypted elementary data stream; and system information (SI) encrypted under a first encryption system.
64. The apparatus according to claim 63, further comprising the system information (SI) encrypted under a second encryption system.
65. The apparatus according to claim 64, wherein the unencrypted elementary data stream is modulated to a first frequency band and wherein the encrypted SI
is modulated to a second frequency band.
is modulated to a second frequency band.
66. The apparatus according to claim 63, wherein the unencrypted elementary data stream is modulated to a first frequency band and wherein the encrypted SI
is modulated to a second frequency band.
is modulated to a second frequency band.
67. A television set-top box, comprising:
a receiver that receives a television signal comprising content and encrypted system information;
a decrypter that decrypts the system information; and a decoder that decodes the content.
a receiver that receives a television signal comprising content and encrypted system information;
a decrypter that decrypts the system information; and a decoder that decodes the content.
68. The apparatus according to claim 67, wherein the content is decoded according to the information.
69. The apparatus according to claim 67, wherein the system information includes channel identifier information for identifying the content.
70. The apparatus according to claim 67, wherein the system information is received in an out of band receiver.
71. The apparatus according to claim 68, wherein the system information is received in an in-band receiver.
72. A method of encrypting a television signal, comprising:
encrypting an elementary stream of the television signal according to a first encryption method to produce a first encrypted elementary stream; and encrypting the elementary stream according to a second encryption method to produce a second encrypted elementary stream.
encrypting an elementary stream of the television signal according to a first encryption method to produce a first encrypted elementary stream; and encrypting the elementary stream according to a second encryption method to produce a second encrypted elementary stream.
73. The method according to claim 72, further comprising distributing an unencrypted video portion of the television signal along with the first and second encrypted elementary streams.
74. The method according to claim 72, wherein the television signal is a digital television signal, and wherein the encrypting comprises encrypting packets identified as one of audio elementary stream packets, video elementary stream packets and system information elementary stream packets.
75. The method according to claim 74, wherein the digital television signal complies with an MPEG standard, and wherein the elementary stream packets are identified for encryption by a packet identifier (PID).
76. A method of encrypting a television signal, comprising:
encrypting a selected elementary stream of the television signal according to a first encryption method to produce a first encrypted elementary stream;
and combining the first encrypted elementary stream with at feast one unencrypted elementary stream of the television signal to produce a partially encrypted television signal.
encrypting a selected elementary stream of the television signal according to a first encryption method to produce a first encrypted elementary stream;
and combining the first encrypted elementary stream with at feast one unencrypted elementary stream of the television signal to produce a partially encrypted television signal.
77. The method according to claim 76, wherein the television signal is a digital television signal, and wherein the encrypting comprises encrypting packets identified as the selected elementary stream packets.
78. The method according to claim 76, wherein the digital television signal complies with an MPEG standard; and wherein the selected elementary stream packets are identified for encryption by a packet identifier (PID).
79. The method according to claim 76, further comprising distributing the partially encrypted television signal over one of a cable system, a terrestrial broadcast system and a satellite system.
80. The method according to claim 76, wherein the television signal is a digital television signal, and wherein the encrypting comprises encrypting packets identified as one of audio elementary stream packets, video elementary stream packets and system information elementary stream packets.
81. An electronic storage medium storing instructions which, when executed on a programmed processor, carry out the method of encrypting a television signal according to claim 76.
82. An electronic transmission medium carrying art encrypted television signal encrypted by the method according to claim 76.
Priority Applications (9)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/US2002/040051 WO2003061173A2 (en) | 2002-01-02 | 2002-12-13 | Elementary stream partial encryption |
| KR1020047010464A KR101004196B1 (en) | 2002-01-02 | 2002-12-13 | Elementary stream partial encryption |
| KR1020097003359A KR100988992B1 (en) | 2002-01-02 | 2002-12-13 | Elementary stream partial encryption |
| EP02792388A EP1486071A4 (en) | 2002-01-02 | 2002-12-13 | Elementary stream partial encryption |
| JP2003561138A JP4446743B2 (en) | 2002-01-02 | 2002-12-13 | Elementary stream partial encryption |
| KR1020107013823A KR101029427B1 (en) | 2002-01-02 | 2002-12-13 | Elementary Stream Partial Encryption |
| AU2002357846A AU2002357846A1 (en) | 2002-01-02 | 2002-12-13 | Elementary stream partial encryption |
| MXPA04006400A MXPA04006400A (en) | 2002-01-02 | 2002-12-13 | Elementary stream partial encryption. |
| CN028284526A CN1633809B (en) | 2002-01-02 | 2002-12-13 | Elementary stream partial encryption |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US34371001P | 2001-10-26 | 2001-10-26 | |
| US60/343,710 | 2001-10-26 | ||
| US10/037,914 | 2002-01-02 | ||
| US10/037,914 US7124303B2 (en) | 2001-06-06 | 2002-01-02 | Elementary stream partial encryption |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2405865A1 true CA2405865A1 (en) | 2003-04-26 |
| CA2405865C CA2405865C (en) | 2012-06-05 |
Family
ID=26714618
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2405865 Expired - Lifetime CA2405865C (en) | 2001-10-26 | 2002-10-01 | Elementary stream partial encryption |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2405865C (en) |
-
2002
- 2002-10-01 CA CA 2405865 patent/CA2405865C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA2405865C (en) | 2012-06-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20221003 |