CA2498346A1 - Selective encryption for video on demand - Google Patents

Selective encryption for video on demand Download PDF

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Publication number
CA2498346A1
CA2498346A1 CA002498346A CA2498346A CA2498346A1 CA 2498346 A1 CA2498346 A1 CA 2498346A1 CA 002498346 A CA002498346 A CA 002498346A CA 2498346 A CA2498346 A CA 2498346A CA 2498346 A1 CA2498346 A1 CA 2498346A1
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Canada
Prior art keywords
content
encrypted
vod
segments
produce
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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.)
Granted
Application number
CA002498346A
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French (fr)
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CA2498346C (en
Inventor
Brant L. Candelore
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Sony Electronics Inc
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Individual
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Publication date
Priority claimed from US10/273,903 external-priority patent/US7302059B2/en
Priority claimed from US10/273,905 external-priority patent/US7376233B2/en
Priority claimed from US10/274,084 external-priority patent/US7155012B2/en
Priority claimed from US10/274,019 external-priority patent/US7292690B2/en
Application filed by Individual filed Critical Individual
Publication of CA2498346A1 publication Critical patent/CA2498346A1/en
Application granted granted Critical
Publication of CA2498346C publication Critical patent/CA2498346C/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
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
    • H04N21/4405—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving video stream decryption
    • H04N21/44055—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving video stream decryption by partially decrypting, e.g. decrypting a video stream that has been partially encrypted
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    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/234—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs
    • H04N21/2343—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements
    • H04N21/234345—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements the reformatting operation being performed only on part of the stream, e.g. a region of the image or a time segment
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    • H04N21/23439—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements for generating different versions
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    • H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
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    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
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    • H04N21/440245—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display the reformatting operation being performed only on part of the stream, e.g. a region of the image or a time segment
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    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
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    • H04N21/633—Control signals issued by server directed to the network components or client
    • H04N21/6332—Control signals issued by server directed to the network components or client directed to client
    • H04N21/6334—Control signals issued by server directed to the network components or client directed to client for authorisation, e.g. by transmitting a key
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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Databases & Information Systems (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Graphics (AREA)
  • Human Computer Interaction (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Television Signal Processing For Recording (AREA)

Abstract

A video on demand (VOD) method, consistent with the invention involves storing multipleselective encrypted VOD cotnent on a VOD server; receiving an order for the VOD contentspecifying delivery to a target decoder; determining what CA encryption system is associatedwith the order; stripping all encrypted segments from the multiple selectively encrypted contentthat are not associated witht he order to produce single selectively encrypted VOD content tothe target decoder. The multiple selectively encrypted VOD content can be created by examining unencrypted data representing digital content to identify segments of content for encryption; encrypting the identified segments fo content using a first encryption method associated with a first conditional access system to produce second encrypted segments; and replacing the identified segments of content witht he first encrypted content and the second encrypted content in the digital content, to produce the multipe selectively encrypted VOD content.

Claims (20)

1. A video on demand (VOD) method, comprising:
storing multiple selective encrypted VOD content on a VOD server;
receiving an order for the VOD content specifying delivery to a target decoder;
determining what CA encryption system is associated with the order;
stripping all encrypted segments from the multiple selectively encrypted content that are not associated with the order to produce single selectively encrypted VOD content; and sending the single selectively encrypted VOD content to the target decoder.
2. The method according to claim 1, further comprising:
examining unencrypted data representing digital content to identify segments of content for encryption;
encrypting the identified segments of content using a first encryption method associated with a first conditional access system to produce first encrypted segments;
encrypting the identified segments of content using a second encryption method associated with a second conditional access system to produce second encrypted segments; and replacing the identified segments of content with the first encrypted content and the second encrypted content in the digital content, to produce the multiple selectively encrypted VOD content.
3. The method according to claim 1, further comprising associating a program identifier with the single selectively encrypted VOD content, wherein the same PIDs are used for encrypted and unencrypted segments of content.
4. The method according to claim 1, wherein the decoder comprises a television Set-top box.
5. The method according to claim 1, wherein the VOD server resides at a cable hub.
6. A computer readable medium storing instructions which, when executed on a programmed processor, carry out the VOD method according to claim 1.
7. An electronic transmission medium carrying single selectively encrypted VOD content created by the method according to claim 1.
8. A video on demand (VOD) method, comprising:

examining unencrypted data representing digital content to identify segments of content for encryption;
encrypting the identified segments of content using a first encryption method associated with a first conditional access system to produce first encrypted segments;
encrypting the identified segments of content using a second encryption method associated with a second conditional access system to produce second encrypted segments;
replacing the identified segments of content with the first encrypted content and the second encrypted content in the digital content, to produce the multiple selectively encrypted VOD content;
storing the multiple selective encrypted VOD content on a VOD server residing at a cable hub;
receiving an order for the VOD content specifying delivery to a target decoder;
determining what CA encryption system is associated with the order;
stripping all encrypted segments from the multiple selectively encrypted content that are not associated with the order to produce single selectively encrypted VOD content;
associating a program identifier with the single selectively encrypted VOD
content, wherein the same PIDs are used for encrypted and unencrypted segments of content; and sending the single selectively encrypted VOD content to the target decoder.
9. A video on demand (VOD) encoder, comprising:

a programmed processor that examines unencrypted data representing digital content to identify segments of content for encryption;
a first encrypter that encrypts the identified segments of content using a first encryption method associated with a first conditional access system to produce first encrypted segments;
a second encrypter that encrypts the identified segments of content using a second encryption method associated with a second conditional access system to produce second encrypted segments;
wherein the programmed processor further receives the first and second encrypted segments and replacing the identified segments of content with the first encrypted content and the second encrypted content in the digital content, to produce the multiple selectively encrypted VOD content;
means for storing the multiple selective encrypted VOD content;
means for receiving an order for the VOD content specifying delivery to a target decoder;
means for determining what CA encryption system is associated with the order; and wherein the programmed processor strips all encrypted segments from the multiple selectively encrypted content that are not associated with the order to produce single selectively encrypted VOD content.
10. The encoder according to claim 9, wherein the programmed processor further associates a program identifier with the single selectively encrypted VOD
content, wherein the same PIDs are used for encrypted and unencrypted segments of content, and sends the single selectively encrypted VOD content to the target decoder.
11. A selectively encrypted video on demand (VOD) system, comprising:

a VOD server storing multiple selective encrypted VOD content;
program means running on a programmed processor for receiving an order for the VOD content specifying delivery to a target decoder, and for determining a CA encryption system associated with the order;
wherein, in response to the order, the VOD server strips all encrypted segments from the multiple selectively encrypted content that are not associated with the order to produce single selectively encrypted VOD content;
a target decoder addressable by the VOD server; and means for sending the single selectively encrypted VOD content from the VOD server to the target decoder.
12. The system according to claim 11, wherein:
the VOD server carries out a programmed process that examines unencrypted data representing digital content to identify segments of content for encryption;
and further comprising:
a first encrypter that encrypts the identified segments of content using a first encryption method associated with a first conditional access system to produce first encrypted segments;
a second encrytper that encrypts the identified segments of content using a second encryption method associated with a second conditional access system to produce second encrypted segments; and wherein the VOD server replaces the identified segments of content with the first encrypted content and the second encrypted content in the digital content, to produce the multiple selectively encrypted VOD content.
13. The system according to claim 12, wherein the VOD server further associates a program identifier with the single selectively encrypted VOD
content, wherein the same PIDs are used for encrypted and unencrypted segments of content.
14. The system according to claim 11, wherein the decoder comprises a television Set-top box.
15. The system according to claim 11, wherein the VOD server resides at a cable hub.
16. The system according to claim 11, wherein the VOD server resides at a cable system head end.
17. An electronic storage medium storing selectively encrypted video on demand (VOD) programming, comprising:
a file representing multiple selective encrypted VOD content comprising:
segments of unencrypted VOD content;
first encrypted segments of VOD content encrypted using a first encryption method associated with a first conditional access system;
second encrypted segments of VOD content encrypted using a second encryption method associated with a second conditional access system;
the first and second encrypted segments of VOD content representing the same segment of VOD content when not encrypted;
a first segment of code that when executed operates to remove one of the first and second encrypted segments of VOD content from the multiple selective encrypted VOD content to produce single selectively encrypted content for transmission to a target decoder.
18. The electronic storage medium according to claim 17, wherein the first segment of code operates to remove one of the first and second encrypted segments of VOD content upon receipt of an order for the VOD content specifying delivery to a target decoder, and upon determining which CA
encryption system is associated with the order.
19. The electronic storage medium according to claim 17, further comprising a second segment of code that sends the single selectively encrypted VOD content to the target decoder.
20. The electronic storage medium according to claim 17, further comprising a third segment of code that associates a program identifier with the single selectively encrypted VOD content, wherein the same PIDs are used for encrypted and unencrypted segments of content.
CA2498346A 2002-09-09 2003-09-08 Selective encryption for video on demand Expired - Lifetime CA2498346C (en)

Applications Claiming Priority (11)

Application Number Priority Date Filing Date Title
US40967502P 2002-09-09 2002-09-09
US60/409,675 2002-09-09
US10/273,903 US7302059B2 (en) 2002-01-02 2002-10-18 Star pattern partial encryption
US10/273,905 US7376233B2 (en) 2002-01-02 2002-10-18 Video slice and active region based multiple partial encryption
US10/274,084 2002-10-18
US10/274,019 2002-10-18
US10/273,905 2002-10-18
US10/274,084 US7155012B2 (en) 2002-01-02 2002-10-18 Slice mask and moat pattern partial encryption
US10/273,903 2002-10-18
US10/274,019 US7292690B2 (en) 2002-01-02 2002-10-18 Video scene change detection
PCT/US2003/027775 WO2004036892A2 (en) 2002-09-09 2003-09-08 Selective encryption for video on demand

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US7487532B2 (en) 2003-01-15 2009-02-03 Cisco Technology, Inc. Optimization of a full duplex wideband communications system
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US20070006253A1 (en) * 2005-06-29 2007-01-04 Pinder Howard G Partial pre-encryption with network-based packet sorting
GB0603923D0 (en) 2006-02-28 2006-04-05 Perkinelmer Ltd Apparatus and methods for imaging and modification of biological samples

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US6415031B1 (en) * 1999-03-12 2002-07-02 Diva Systems Corporation Selective and renewable encryption for secure distribution of video on-demand
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WO2004036892A3 (en) 2005-06-23

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