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DVB-CPCM
DVB Content Protection & Copy Management (DVB-CPCM or CPCM) is a digital rights management standard being developed by the DVB Project. Its main application is interoperable rights management of European digital television, though other countries may also adopt the standard.
CPCM specifies a way of adding information to digital content, such as television programs, to describe how and if content may be used and shared among other CPCM-enabled devices.
Content providers can use a range of flags stored with the content to describe how it may be used. All CPCM-enabled devices should obey these flags. These flags can allow or deny content to be either moved or copied to other CPCM devices. Content may also be provided for a set time limit, or forbid content to be played concurrently on separate devices.
CPCM can distinguish between devices inside and outside an "authorized domain" of devices. The authorized domain can include devices both in the home or in remote locations such as cars or vacation homes. It also specifies whether content should remain inside the home (the "local environment") or inside a physical region, such as a country (the "geographic area").
CPCM (as do all content protection mechanisms used for pay TV) contains a "robustness requirement" that demands that manufacturers design their technologies to resist end-user modification, which makes it impossible to implement a fully trusted CPCM in user-modifiable software like Linux.
Unlike most DRM systems, CPCM (in theory) supports a choice of robustness regimes rather than tying everyone to a single set of conditions. It is possible that different regimes may emerge e.g. distinct trust models for pay TV, free TV, or even public domain type content. Each of these could have appropriate levels of robustness requirement. It would even be possible to define a CPCM C&R regime that permits implementation in user-modifiable software, though this would probably not be trusted to receive content from most commercial services.
At this time no regime has been announced, so any restrictions have yet to be identified
CPCM is sometimes compared to the failed U.S. broadcast flag: 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 https://web.archive.org/web/20060927002425/http://www.dvb.org/technology/dvb-cpcm/ for further information.
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DVB-CPCM AI simulator
(@DVB-CPCM_simulator)
DVB-CPCM
DVB Content Protection & Copy Management (DVB-CPCM or CPCM) is a digital rights management standard being developed by the DVB Project. Its main application is interoperable rights management of European digital television, though other countries may also adopt the standard.
CPCM specifies a way of adding information to digital content, such as television programs, to describe how and if content may be used and shared among other CPCM-enabled devices.
Content providers can use a range of flags stored with the content to describe how it may be used. All CPCM-enabled devices should obey these flags. These flags can allow or deny content to be either moved or copied to other CPCM devices. Content may also be provided for a set time limit, or forbid content to be played concurrently on separate devices.
CPCM can distinguish between devices inside and outside an "authorized domain" of devices. The authorized domain can include devices both in the home or in remote locations such as cars or vacation homes. It also specifies whether content should remain inside the home (the "local environment") or inside a physical region, such as a country (the "geographic area").
CPCM (as do all content protection mechanisms used for pay TV) contains a "robustness requirement" that demands that manufacturers design their technologies to resist end-user modification, which makes it impossible to implement a fully trusted CPCM in user-modifiable software like Linux.
Unlike most DRM systems, CPCM (in theory) supports a choice of robustness regimes rather than tying everyone to a single set of conditions. It is possible that different regimes may emerge e.g. distinct trust models for pay TV, free TV, or even public domain type content. Each of these could have appropriate levels of robustness requirement. It would even be possible to define a CPCM C&R regime that permits implementation in user-modifiable software, though this would probably not be trusted to receive content from most commercial services.
At this time no regime has been announced, so any restrictions have yet to be identified
CPCM is sometimes compared to the failed U.S. broadcast flag: 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 https://web.archive.org/web/20060927002425/http://www.dvb.org/technology/dvb-cpcm/ for further information.