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Broadcast Flag

CPCM is sometimes erroneously compared to the failed U.S. broadcast flag.

CPCM is only applied in the home after the broadcast has been received, never added to a broadcast signal.

The DVB has now defined signals within the DVB Service Information (DVB-SI) which allow a free-to-air broadcaster to signal correct behaviour for content protection systems such as CPCM. These signals are not specific to use with CPCM, and can also be used to control HDCP or similar systems. However, CPCM does defined an exact mapping of these SI signals to the CPCM usage state information. See http://www.dvb.org/technology/dvb-cpcm for further information.

It is worth noting that Europe does not have a single regulating authority like the FCC, so an exact parallel to the enforcement rules of the failed US approach is unlikely.

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HDCP & DTCP-IP

HDCP protects a single wire connection, typically DVI or HDMI. CPCM is network independent and can be used on LAN, WiFi, and in theory even on IEEE 1394 Firewire links.

DTCP-IP is a link protection system similar to HDCP, but operates over a LAN or WLAN connection.

Both HDCP and DTCP-IP are link protection "render and toss" technologies that generally prohibit the receiving device from recording or redistributing the content. Also, both are designed to prevent connection of devices that are not in close proximity to one another. CPCM by contrast can allow for recording and/or remote access depending on the specific rights granted with the content.

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Publication

The full technical specification of DVB-CPCM is now published by the DVB Project and can be freely downloaded from this location.

The normative sections have now all been approved for publication by the DVB Steering Board, and will be published by ETSI as a formal European Standard as ETSI TS 102 825-X where X refers to the Part number of specification.

Nobody has yet stepped forward to provide a Compliance and Robustness regime for the standard (though several are rumoured to be in development), so it is not presently possible to fully implement a system, as there is nowhere to obtain the necessary device certificates.

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See also

• CI+

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External links

Current standard (Official sites)

• DVB Project and CPCM Specifications
• Electronic Frontier Foundation
  • DVB CPCM Is a Stealth Attack on Europeans' Digital Rights
  • Who Controls Your Television?
• Fastcom Technology Fastcom Technology showed at the 50th DVB-CPT meeting (7-9 February 2007) the first demonstrator of the DVB-CPCM standard and is further developing it.

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