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Content Protection Revocation Information Delivery & Processing

Content Protection Revocation Information Delivery & Processing. Copy Protection Technical Working Group Meeting September 1, 2004. Brad Hunt Chief Technology Officer Motion Picture Association of America, Inc. Content Protection Device Key Revocation. Definition -.

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Content Protection Revocation Information Delivery & Processing

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  1. Content Protection Revocation Information Delivery & Processing Copy Protection Technical Working Group Meeting September 1, 2004 Brad Hunt Chief Technology Officer Motion Picture Association of America, Inc.

  2. Content Protection Device Key Revocation Definition - “The capability of a licensed content protection technology to provide a means to revoke the digital keys associated with one or more devices’ ability to authenticate and gain access to content protected using the licensed technology.”

  3. Importance of Content Protection Revocation • Lost, stolen, and cloned device keys can be used to produce non-compliant devices that ignore compliance rules. • Device key revocation can be used to disable these non-licensed devices’ ability to gain access to protected content. • The continuing effectiveness of a content protection technology greatly relies on device key revocation. • Dissemination of up-to-date revocation information (System Renewability Messages) depends on SRM delivery with new content. • Some CP technologies (e.g. HDCP) do not store Revocation Lists and must rely on real-time delivery and downstream conveyance of SRMs.

  4. CA-Encrypted Digital Cable with DTCP.SRM HDCP.SRM Digital Cable Receiver QAM Tuner/ Demod 4C CPRM Recorder 4C CPRM Recorder IEEE 1394 IEEE 1394 IEEE 1394 DTCP.SRM DTCP.SRM DTCP.SRM HDCP.SRM HDCP.SRM HDCP.SRM CableCard DTCP DTCP MPEG2 SPTS DTCP MPEG2 SPTS MPEG2 SPTS MPEG-2 TSP DTCP.SRM Process Record Copy Record Copy Play Copy Play Copy DTCP.SRM HDCP.SRM 4C CPRM DVD-RW 4C CPRM DVD-RW HDCP.SRM Process HDCP HDCP.SRM HDCP.SRM DTCP.SRM DTCP.SRM Play Copy Play Copy HDMI HDCP.SRM Process HDCP.SRM Process HDCP HDCP HDMI HDMI Digital Cable Plug and Play ReceiverContent Protection Revocation

  5. Proposal for Revocation Information Carriage • Content protection revocation information would be carried in the MPEG-2 Transport Stream as private data in a long form Private Section belonging to a Private Table. • The MPEG-2 Registration Descriptor would be used to specify the identity of the Private Section revocation data using the format_identifier. • Content protection licensors obtain from the Registration Authority (SMPTE) a unique format_identifier to use in identifying their revocation information private data. • The necessary standards are in place to do this today. • The MPAA has asked the ATSC to undertake the documentation of a Recommended Practice once agreement on a common format for identification and carriage is reached.

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