CA2413881A1 - Star pattern partial encryption - Google Patents

Star pattern partial encryption Download PDF

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Publication number
CA2413881A1
CA2413881A1 CA002413881A CA2413881A CA2413881A1 CA 2413881 A1 CA2413881 A1 CA 2413881A1 CA 002413881 A CA002413881 A CA 002413881A CA 2413881 A CA2413881 A CA 2413881A CA 2413881 A1 CA2413881 A1 CA 2413881A1
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CA
Canada
Prior art keywords
slices
macroblocks
packets
star pattern
encrypted
Prior art date
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Granted
Application number
CA002413881A
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French (fr)
Other versions
CA2413881C (en
Inventor
Brant L. Candelore
Henry Derovanessian
Leo M. Pedlow, Jr.
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Sony Electronics Inc
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Individual
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Filing date
Publication date
Priority claimed from US10/037,498 external-priority patent/US7127619B2/en
Application filed by Individual filed Critical Individual
Priority to CA2746625A priority Critical patent/CA2746625C/en
Priority to CA2746782A priority patent/CA2746782C/en
Priority to CA2746401A priority patent/CA2746401C/en
Publication of CA2413881A1 publication Critical patent/CA2413881A1/en
Application granted granted Critical
Publication of CA2413881C publication Critical patent/CA2413881C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible
    • H04N7/1675—Providing digital key or authorisation information for generation or regeneration of the scrambling sequence
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K1/00—Secret communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
    • H04L63/0428—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/14—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols using a plurality of keys or algorithms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H04N21/2389—Multiplex stream processing, e.g. multiplex stream encrypting
    • H04N21/23895—Multiplex stream processing, e.g. multiplex stream encrypting involving multiplex stream encryption
    • H04N21/23897—Multiplex stream processing, e.g. multiplex stream encrypting involving multiplex stream encryption by partially encrypting, e.g. encrypting only the ending portion of a movie
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2209/00—Additional information or applications relating to cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
    • H04L2209/60—Digital content management, e.g. content distribution

Abstract

A selective encryption encoder consistent with certain embodiments of the invention has a packet identifier that identifies packets of a specified packet type, the specified packet type being defined by packets occurring in a star pattern approximately situated at an upper center of an image which contain intra-coded macroblocks. A packet duplicator duplicates the identified packets to produce first and second sets of the identified packets. The packets are sent to and from a primary encryption encoder to encrypt the first set of identified packets under a first encryption method. A secondary encrypter encrypts the second set of identified packets under a second encryption method.

Claims (105)

1. A method of partially dual encrypting a digital video signal, comprising:
examining unencrypted packets of data in the digital video signal to identify a specified packet type, the specified packet type comprising packets occurring in a star pattern approximately situated at approximately a center of an image;
encrypting packets identified as being of the specified packet type using a first encryption method to produce first encrypted packets;
encrypting the packets identified as being of the specified packet type using a second encryption method to produce second encrypted packets; and replacing the unencrypted packets of the specified packet type with the first encrypted packets and the second encrypted packets in the digital video signal to produce a partially dual encrypted video signal.
2. The method according to claim 1, wherein the specified packet type further comprises packets containing an intra-coded macroblock within the star pattern.
3. The method according to claim 2, wherein a video frame comprises 30 slices each having 33 macroblocks, and wherein the star pattern is defined by:
macroblocks 14-21 in slices 1-6 and 22-30, macroblocks 11-23 of slices 7-12 and 19-21 and macroblocks 1-33 of slices 13-18.
4. The method according to claim 2, wherein a video frame comprises 45 slices each having 80 macroblocks, and wherein the star pattern is defined by:
macroblocks 34-51 in slices 1-9 and 32-45, macroblocks 26-56 of slices 10-18 and 28-31 and macroblocks 1-80 of slices 19-27.
5. The method according to claim 2, wherein a video frame comprises 68 slices each having 120 macroblocks, and wherein the star pattern is defined by:
macroblocks 50-77 in slices 1-12 and 49-60, macroblocks 40-84 of slices 13-27 and 42-48 and macroblocks 1-120 of slices 28-41.
6. The method according to claim 1, wherein a video frame comprises 30 slices each having 33 macroblocks, and wherein the star pattern is defined by:
macroblocks 14-21 in slices 1-6 and 22-30, macroblocks 11-23 of slices 7-12 and 19-21 and macroblocks 1-33 of slices 13-18.
7. The method according to claim 1, wherein a video frame comprises 68 slices each having 120 macroblocks, and wherein the star pattern is defined by:
macroblocks 50-77 in slices 1-12 and 49-60, macroblocks 40-84 of slices 13-27 and 42-48 and macroblocks 1-120 of slices 28-41.
8. The method according to claim 1, wherein a video frame comprises 45 slices each having 80 macroblocks, and wherein the star pattern is defined by:
macroblocks 34-51 in slices 1-9 and 32-45, macroblocks 26-56 of slices 10-18 and 28-31 and macroblocks 1-80 of slices 19-27.
9. The method according to claim 1, wherein the star pattern is centered above a true center of the image.
10. The method according to claim 1, wherein the star pattern has rays extending horizontally across a full width of the image.
11. The method according to claim 1, wherein the star pattern has rays extending vertically across a full height of the image.
12. The method according to claim 1, wherein the star pattern has a rectangular central region centered approximately one slice above a center of the image.
13. A computer readable medium storing instructions which, when executed on a programmed processor, carry out the method of encrypting a digital video signal according to claim 1.
14. The computer readable medium of claim 13, wherein the medium comprises one of an electronic storage medium and a carrier wave.
15. An electronic transmission medium carrying an encrypted digital video signal encrypted by the method according to claim 1.
16. A selective encryption encoder, comprising:
a packet identifier that identifies packets of a specified packet type, the specified packet type comprising packets occurring in a star pattern approximately situated at a center of an image;
a packet duplicator that duplicates the identified packets to produce first and second sets of the identified packets;
means for sending and receiving packets to and from a primary encryption encoder to encrypt the first set of identified packets under a first encryption method;
a secondary encrypter for encrypting the second set of identified packets under a second encryption method.
17. The selective encryption encoder according to claim 16, wherein wherein the specified packet type further comprises packets containing an intra-coded encrypted within the star pattern.
18. The selective encryption encoder according to claim 17, wherein a video frame comprises 30 slices each having 33 macroblocks, and wherein the star pattern is defined by: macroblocks 14-21 in slices 1-6 and 22-30, macroblocks 23 of slices 7-12 and 19-21 and macroblocks 1-33 of slices 13-18.
19. The selective encryption encoder according to claim 17, wherein a video frame comprises 45 slices each having 80 macroblocks; and wherein the star pattern is defined by: macroblocks 34-51 in slices 1-9 and 32-45, macroblocks 56 of slices 10-18 and 28-31 and macroblocks 1-80 of slices 19-27.
20. The selective encryption encoder according to claim 17, wherein a video frame comprises 68 slices each having 120 macroblocks, and wherein the star pattern is defined by: macrblocks 50-77 in slices 1-12 and 49-60, macroblocks 84 of slices 13-27 and 42-48 and macroblocks 1-120 of slices 28-41.
21. The selective encryption encoder according to claim 16, wherein a video frame comprises 30 slices each having 33 macroblocks, and wherein the star pattern is defined by: macroblocks 14-21 in slices 1-6 and 22-30, macroblocks 23 of slices 7-12 and 19-21 and macroblocks 1-33 of slices 13-18.
22. The selective encryption encoder according to claim 16, wherein a video frame comprises 68 slices each having 120 macroblocks, and wherein the star pattern is defined by: macroblocks 50-77 in slices 1-12 and 49-60, macroblocks 84 of slices 13-27 and 42-48 and macroblocks 1-120 of slices 28-41.
23. The selective encryption encoder according to claim 16, wherein a video frame comprises 45 slices each having 80 macroblocks, and wherein the star pattern is defined by: macroblocks 34-51 in slices 1-9 and 32-45, macroblocks 56 of slices 10-18 and 28-31 and macroblocks 1-80 of slices 19-27.
24. The selective encryption encoder according to claim 16, wherein the star pattern is centered above a true center of the image.
25. The selective encryption encoder according to claim 16, wherein the star pattern has rays extending horizontally across a full width of the image.
26. The selective encryption encoder according to claim 16, wherein the star pattern has rays extending vertically across a full height of the image.
27. The selective encryption encoder according to claim 16, wherein the star pattern has a rectangular central region centered approximately one slice above a center of the image.
28. A method of partially encrypting a digital video signal, comprising:
examining unencrypted packets of data in the digital video signal to identify a specified packet type, the specified packet type comprising packets occurring in a star pattern;
encrypting packets identified as being of the specified packet type using a first encryption method to produce first encrypted packets; and replacing the unencrypted packets of the specified packet type with the first encrypted packets in the digital video signal to produce a partially encrypted video signal.
29. The method according to claim 28, further comprising encrypting the packets identified as being of the specified packet type using a second encryption method to produce second encrypted packets; and inserting the second encrypted packets into the digital video signal to produce a dual partially encrypted video signal.
30. The method according to claim 29, wherein the specified packet type further comprises packets containing an intra-coded macroblock within the star pattern.
31. The method according to claim 28, wherein a video frame comprises 30 slices each having 33 macroblocks, and wherein the star pattern is defined by:
macroblocks 14-21 in slices 1-6 and 22-30, macroblocks 11-23 of slices 7-12 and 19-21 and macroblocks 1-33 of slices 13-18.
32. The method according to claim 28, wherein a video frame comprises 45 slices each having 80 macroblocks, and wherein the star pattern is defined by:
macroblocks 34-51 in slices 1-9 and 32-45, macroblocks 26-56 of slices 10-18 and 28-31 and macroblocks 1-80 of slices 19-27.
33. The method according to claim 28, wherein a video frame comprises 68 slices each having 120 macroblocks, and wherein the star pattern is defined by:
macroblocks 50-77 in slices 1-12 and 49-60, macroblocks 40-84 of slices 13-27 and 42-48 and macroblocks 1-120 of slices 28-41.
34. The method according to claim 28, wherein the star pattern is centered above a true center of the image.
35. The method according to claim 28, wherein the star pattern has rays extending horizontally across a full width of the image.
36. The method according to claim 28, wherein the star pattern has rays extending vertically across a full height of the image.
37. The method according to claim 28, wherein the star pattern has a rectangular central region centered approximately one slice above a center of the image.
38. A computer readable medium storing instructions which, when executed on a programmed processor, carry out the method of encrypting a digital video signal according to claim 28.
39. The computer readable medium of claim 38, wherein the medium comprises one of an electronic storage medium and a carrier wave.
40. An electronic transmission medium carrying an encrypted digital video signal encrypted by the method according to claim 28.
41. A method of partially encrypting a digital video signal, comprising:
examining unencrypted packets of data in the digital video signal to identify a specified packet type, the specified packet type comprising packets occurring in a star pattern approximately situated at an upper center of an image, and containing an intra-coded macroblock, the star pattern being centered above a true center of the image and having rays extending horizontally and vertically across a full width and height of the image respectively, the star pattern further having a rectangular central portion centered approximately one slice above a center of the image;
encrypting packets identified as being of the specified packet type using a first encryption method to produce first encrypted packets; and replacing the unencrypted packets of the specified packet type with the first encrypted packets in the digital video signal to produce a partially encrypted video signal.
42. The method according to claim 41, wherein a video frame comprises 30 slices each having 33 macroblocks, and wherein the star pattern is defined by:
macroblocks 14-21 in slices 1-6 and 22-30, macroblocks 11-23 of slices 7-12 and 19-21 and macroblocks 1-33 of slices 13-18.
43. The method according to claim 41, wherein a video frame comprises 45 slices each having 80 macroblocks, and wherein the star pattern is defined by:
macroblocks 34-51 in slices 1-9 and 32-45, macroblocks 26-56 of slices 10-18 and 28-31 and macroblocks 1-80 of slices 19-27.
44. The method according to claim 41, wherein a video frame comprises 68 slices each having 120 macroblocks, and wherein the star pattern is defined by:
macroblocks 50-77 in slices 1-12 and 49-60, macroblocks 40-84 of slices 13-27 and 42-48 and macroblocks 1-120 of slices 28-41.
45. A computer readable medium storing instructions which, when executed on a programmed processor, carry out the method of encrypting a digital video signal according to claim 41.
46. The computer readable medium of claim 45, wherein the medium comprises one of an electronic storage medium and a carrier wave.
47. An electronic transmission medium carrying an encrypted digital video signal encrypted by the method according to claim 41.
48. A television set-top box, comprising:
a receiver receiving a digital television signal comprising:
a plurality of unencrypted packets; and a plurality of encrypted packets, wherein the encrypted packets are of at least one selected packet type and the at least one selected packet type comprises packets occurring in a star pattern approximately situated at an upper center of an image;
a decrypter that decrypts the encrypted packets; and a decoder that decodes the unencrypted packets and the decrypted packets to produce a signal suitable for play on a television set.
49. The television set-top box according to claim 48, wherein wherein the specified packet type further comprises packets containing an intra-coded macroblock within the star pattern.
50. The television set-top box according to claim 48, wherein a video frame comprises 30 slices each having 33 macroblocks, and wherein the star pattern is defined by: macroblocks 14-21 in slices 1-6 and 22-30, macroblocks 11-23 of slices 7-12 and 19-21 and macroblocks 1-33 of slices 13-18.
51. The television set-top box according to claim 48, wherein a video frame comprises 45 slices each having 80 macroblocks, and wherein the star pattern is defined by: macroblocks 34-51 in slices 1-9 and 32-45, macroblocks 26-56 of slices 10-18 and 28-31 and macroblocks 1-80 of slices 19-27.

51. The television set-top box according to claim 48, wherein a video frame comprises 68 slices each having 120 macroblocks, and wherein the star pattern is defined by: macroblocks 50-77 in slices 1-12 and 49-60, macroblocks 40-84 of slices 13-27 and 42-48 and macroblocks 1-120 of slices 28-41.
52. The television set-top box according to claim 48, wherein the star pattern is centered above a true center of the image.
53. The television set-top box according to claim 48 wherein the star pattern has rays extending horizontally across a full width of the image.
54. The television set-top box according to claim 48, wherein the star pattern has rays extending vertically across a full height of the image.
55. The television set-top box according to claim 48, wherein the star pattern has a rectangular central region centered approximately one slice above a center of the image.
56. A selective encryption decoder, for decrypting and decoding a selectively encrypted digital video signal, comprising:
a demultiplexer that receives packets of digital video, certain of the packets being unencrypted and certain of the packets being encrypted, wherein certain of the encrypted packets carry data arranged in a star pattern within a video frame;
the unencrypted packets having a first packet identifier (PID) and the encrypted packets having a second packet identifier (PID);
a decrypter receiving the encrypted packets having the second PID and decrypting the encrypted packets using a first encryption method to produce decrypted packets;
a PID remapper that changes at least one of the first and second PIDs so that the unencrypted packets and the decrypted packets have the same PID; and a decoder that decodes the unencrypted and decrypted packets to produce a decoded video signal.
57. The selective encryption decoder according to claim 56, wherein wherein the specified packet type further comprises packets containing an intra-coded macroblock within the star pattern.
58. The selective encryption decoder according to claim 56, wherein a video frame comprises 30 slices each having 33 macroblocks, and wherein the star pattern is defined by: macroblocks 14-21 in slices 1-6 and 22-30, macroblocks 23 of slices 7-12 and 19-21 and macroblocks 1-33 of slices 13-18.
59. The selective encryption decoder according to claim 56, wherein a video frame comprises 45 slices each having 80 macroblocks, and wherein the star pattern is defined by: macroblocks 34-51 in slices 1-9 and 32-45, macroblocks 56 of slices 10-18 and 28-31 and macroblocks 1-80 of slices 19-27:
60. The selective encryption decoder according to claim 56, wherein a video frame comprises 68 slices each having 120 macroblocks, and wherein the star pattern is defined by: macroblocks 50-77 in slices 1-12 and 49-60, macroblocks 84 of slices 13-27 and 42-48 and macroblocks 1-120 of slices 28-41.
61. The selective encryption decoder according to claim 56, wherein the star pattern is centered above a true center of the image.
62. The selective encryption decoder according to claim 56 wherein the star pattern has rays extending horizontally across a full width of the image.
63. The selective encryption decoder according to claim 56, wherein the star pattern has rays extending vertically across a full height of the image.
64. The selective encryption decoder according to claim 56, wherein the star pattern has a rectangular central region centered approximately one slice above a center of the image.
65. A method of decrypting and decoding a selectively encrypted digital video signal, comprising:
receiving packets of digital video, certain of the packets being unencrypted and certain of the packets being encrypted, wherein certain of the encrypted packets carry data arranged in a star pattern within a video frame;
the unencrypted packets having a first packet identifier (PID) and the encrypted packets having a second packet identifier (PID);
decrypting the encrypted packets having the second PID to produce decrypted packets;
remapping at least one of the first and second PIDs so that the unencrypted packets and the decrypted packets have the same PID; and decoding the unencrypted and decrypted packets to produce a decoded video signal.
66. The method according to claim 65, wherein the specified packet type further comprises packets containing an intra-coded macroblock within the star pattern.
67. The method according to claim 65, wherein a video trame comprises 30 slices each having 33 macroblocks, and wherein the star pattern is defined by:
macroblocks 14-21 in slices 1-6 and 22-30, macroblocks 11-23 of slices 7-12 and 19-21 and macroblocks 1-33 of slices 13-18.
68. The method according to claim 65, wherein a video frame comprises 45 slices each having 80 macroblocks, and wherein the star pattern is defined by:
macroblocks 34-51 in slices 1-9 and 32-45, macroblocks 26-56 of slices 10-18 and 28-31 and macroblocks 1-80 of slices 19-27.
69. The method according to claim 65, wherein a video frame comprises 68 slices each having 120 macroblocks, and wherein the star pattern is defined by:
macroblocks 50-77 in slices 1-12 and 49-60, macroblocks 40-84 of slices 13-27 and 42-48 and macroblocks 1-120 of slices 28-41.
70. The method according to claim 65, wherein the star pattern is centered above a true center of the image.
71. The method according to claim 65, wherein the star pattern has rays extending horizontally across a full width of the image.
72. The method according to claim 65, wherein the star pattern has rays extending vertically across a full height of the image.
73. The method according to claim 65, wherein the star pattern has a rectangular central region centered approximately one slice above a center of the image.
74. A computer readable medium storing instructions which, when executed on a programmed processor, carry out the method of encrypting a digital video signal according to claim 65.
75. The computer readable medium of claim 74, wherein the medium comprises one of an electronic storage medium and a carrier wave.
76. An electronic transmission medium carrying a digital video signal decoded and decrypted by the method according to claim 65.
77. A computer readable medium that carries instructions that when executes on a programmed processor to facilitate operation of a video receiver device to decrypt and decode a selectively encoded digital video signal wherein the instructions comprise:

a code segment that controls a demultiplexer that receives packets of digital video, certain of the packets being unencrypted and certain of the packets being encrypted, wherein certain of the encrypted packets carry data arranged in a star pattern within a video frame, the unencrypted packets having a first packet identifier (PID) and the encrypted packets having a second packet identifier (PID);

a code segment that controls decryption of the encrypted packets to produce decrypted packets;

a code segment that controls remapping at least one of the first and second PIDs so that the unencrypted packets and the decrypted packets have the same PID; and a code segment that controls decoding the unencrypted and decrypted packets to produce a decoded video signal.
78. The computer readable medium of claim 77, wherein the medium comprises one of an electronic storage medium and a carrier wave.
79. The computer readable medium according to claim 77, wherein the specified packet type further comprises packets containing an intra-coded macroblock within the star pattern.
80. The computer readable medium according to claim 77, wherein a video frame comprises 30 slices each having 33 macroblocks, and wherein the star pattern is defined by: macroblocks 14-21 in slices 1-6 and 22-30, macroblocks 23 of slices 7-12 and 19-21 and macroblocks 1-33 of slices 13-18.
81. The computer readable medium according to claim 77, wherein a video frame comprises 45 slices each having 80 macroblocks, and wherein the star pattern is defined by: macroblocks 34-51 in slices 1-9 and 32-45, macroblocks 56 of slices 10-18 and 28-31 and macroblocks 1-80 of slices 19-27.
82. The computer readable medium according to claim 77, wherein a video frame comprises 68 slices each having 120 macroblocks, and wherein the star pattern is defined by: macroblocks 50-77 in slices 1-12 and 49-60, macroblocks 84 of slices 13-27 and 42-48 and macroblocks 1-120 of slices 28-41.
83. The computer readable medium according to claim 77, wherein the star pattern is centered above a true center of the image.
84. The computer readable medium according to claim 77, wherein the star pattern has rays extending horizontally across a full width of the image.
85. The computer readable medium according to claim 77, wherein the star pattern has rays extending vertically across a full height of the image.
86. The computer readable medium according to claim 77, wherein the star pattern has a rectangular central region centered approximately one slice above a center of the image.
87. A selectively encrypted digital video signal embodied in a carrier wave, comprising:

a stream of packets of video data, wherein the stream of packets when not encrypted represent a segment of video content;

certain of the packets being unencrypted and certain of the packets being encrypted, wherein certain of the encrypted packets carry video data arranged in a star pattern within a video frame;

a first segment of code that identifies the unencrypted packets by a first packet identifier (PID); and a second segment of code that identifies the encrypted packets by a second packet identifier (PID).
88. The selectively encrypted digital video signal embodied in a carrier wave according to claim 87, wherein the specified packet type further comprises packets containing an intra-coded macroblock within the star pattern.
89. The selectively encrypted digital video signal embodied in a carrier wave according to claim 87, wherein a video frame comprises 30 slices each having macroblocks, and wherein the star pattern is defined by: macroblocks 14-21 in slices 1-6 and 22-30, macroblocks 11-23 of slices 7-12 and 19-21 and macroblocks 1-33 of slices 13-18.
90. The selectively encrypted digital video signal embodied in a carrier wave according to claim 87, wherein a video frame comprises 45 slices each having macroblocks, and wherein the star pattern is defined by: macroblocks 34-51 in slices 1-9 and 32-45, macroblocks 26-56 of slices 10-18 and 28-31 and macroblocks 1-80 of slices 19-27.
91. The selectively encrypted digital video signal embodied in a carrier wave according to claim 87, wherein a video frame comprises 68 slices each having macroblocks, and wherein the star pattern is defined by: macroblocks 50-77 in slices 1-12 and 49-60, macroblocks 40-84 of slices 13-27 and 42-48 and macroblocks 1-120 of slices 28-41.
92. The selectively encrypted digital video signal embodied in a carrier wave according to claim 87, wherein the star pattern is centered above a true center of the image.
93. The selectively encrypted digital video signal embodied in a carrier wave according to claim 87, wherein the star pattern has rays extending horizontally across a full width of the image.
94. The selectively encrypted digital video signal embodied in a carrier wave according to claim 87, wherein the star pattern has rays extending vertically across a full height of the image.
95. The selectively encrypted digital video signal embodied in a carrier wave according to claim 87, wherein the star pattern has a rectangular central region centered approximately one slice above a center of the image.
96. A selectively encrypted digital video signal embodied in a computer readable medium, comprising:

a sequence of packets of video data, wherein the sequence of packets when not encrypted represent a segment of video content;

wherein certain of the packets are unencrypted;

wherein certain of the packets have been produced by decrypting encrypted packets;

wherein certain of the encrypted packets carry data arranged in a star pattern within a video frame; and a segment of code that identifies the unencrypted packets by a first packet identifier (PID); and a segment of code that identifies the encrypted packets by a second packet identifier (PID).
97. The selectively encrypted digital video signal embodied in a computer readable medium according to claim 96, wherein the specified packet type further comprises packets containing an intra-coded macroblock within the star pattern.
98. The selectively encrypted digital video signal embodied in a computer readable medium according to claim 96, wherein a video frame comprises 30 slices each having 33 macroblocks, and wherein the star pattern is defined by:
macroblocks 14-21 in slices 1-6 and 22-30, macroblocks 11-23 of slices 7-12 and 19-21 and macroblocks 1-33 of slices 13-18.
99. The selectively encrypted digital video signal embodied in a computer readable medium according to claim 96, wherein a video frame comprises 45 slices each having 80 macroblocks, and wherein the star pattern is defined by:
macroblocks 34-51 in slices 1-9 and 32-45, macroblocks 26-56 of slices 10-18 and 28-31 and macroblocks 1-80 of slices 19-27.
100. The selectively encrypted digital video signal embodied in a computer readable medium according to claim 96, wherein a video frame comprises 68 slices each having 120 macroblocks, and wherein the star pattern is defined by:
macroblocks 50-77 in slices 1-12 and 49-60, macroblocks 40-84 of slices 13-27 and 42-48 and macroblocks 1-120 of slices 28-41.
101. The selectively encrypted digital video signal embodied in a computer readable medium according to claim 96, wherein the star pattern is centered above a true center of the image.
102. The selectively encrypted digital video signal embodied in a computer readable medium according to claim 96, wherein the star pattern has rays extending horizontally across a full width of the image.
103. The selectively encrypted digital video signal embodied in a computer readable medium according to claim 96, wherein the star pattern has rays extending vertically across a full height of the image.
104. The selectively encrypted digital video signal embodied in a computer readable medium according to claim 96, wherein the star pattern has a rectangular central region centered approximately one slice above a center of the image.
105. The selectively encrypted digital video signal embodied in a computer readable medium according to claim 96, wherein the medium comprises one of an electronic storage medium and a carrier wave.
CA2413881A 2002-01-02 2002-12-11 Star pattern partial encryption Expired - Lifetime CA2413881C (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CA2746625A CA2746625C (en) 2002-01-02 2002-12-11 Star pattern partial encryption
CA2746782A CA2746782C (en) 2002-01-02 2002-12-11 Star pattern partial encryption
CA2746401A CA2746401C (en) 2002-01-02 2002-12-11 Star pattern partial encryption

Applications Claiming Priority (16)

Application Number Priority Date Filing Date Title
US10/037,498 US7127619B2 (en) 2001-06-06 2002-01-02 Decoding and decryption of partially encrypted information
US10/037,914 US7124303B2 (en) 2001-06-06 2002-01-02 Elementary stream partial encryption
US10/037,498 2002-01-02
US10/038,217 2002-01-02
US10/038,217 US7336787B2 (en) 2001-06-06 2002-01-02 Critical packet partial encryption
US10/037,499 2002-01-02
US10/037,499 US7151831B2 (en) 2001-06-06 2002-01-02 Partial encryption and PID mapping
US10/037,914 2002-01-02
US10/038,032 US7139398B2 (en) 2001-06-06 2002-01-02 Time division partial encryption
US10/038,032 2002-01-02
US35532602P 2002-02-08 2002-02-08
US60/355,326 2002-02-08
US37290102P 2002-04-16 2002-04-16
US60/372,901 2002-04-16
US10/273,903 US7302059B2 (en) 2002-01-02 2002-10-18 Star pattern partial encryption
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