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

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

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

5. Proposal for Revocation Information Carriage The MPEG-2 Registration Descriptor would be used to specify the identity of the Private Section revocation data using the format_identifier.The MPEG-2 Registration Descriptor would be used to specify the identity of the Private Section revocation data using the format_identifier. The necessary standards are in place to do this today.The necessary standards are in place to do this today. Content protection licensors obtain from the Registration Authority (SMPTE) a unique format_identifier to use in identifying their revocation information private data.Content protection licensors obtain from the Registration Authority (SMPTE) a unique format_identifier to use in identifying their revocation information private data. 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.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 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.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.