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_DVB-CPCM DVB Content Protection & Copy Management Introduction CPCM is a system for Content Protection & Copy Management of commercial digital content delivered to consumer products and home networks. CPCM manages content usage from acquisition into the CPCM system until final consumption, or export from the CPCM system, in accordance with the particular usage rules of that content. Possible sources for commercial digital content include broadcast (e.g., cable, satellite, and terrestrial), Internet-based services, packaged media, and mobile services, among others. CPCM is intended for use in protecting all types of content - audio, video and associated applications and data. CPCM provides specifications to facilitate interoperability of such content after acquisition into CPCM by networked consumer devices for both home networking and remote access. The specification is made up of parts, some of which specify signalling and actions required for technical compliance, and other parts which define the necessary technologies for conformance and interoperability. A Reference Model provides the framework for the CPCM System and is the foundation upon which the remaining specification elements build. This first phase of the specification addresses CPCM for digital content encoded and transported by linear transport systems in accordance with TS 101 154 (Implementation guidelines for the use of MPEG-2 Systems, Video and Audio in satellite, cable and terrestrial broadcasting applications ). A later second phase will address CPCM for content encoded and transported by systems in accordance with future DVB specifications based upon Internet Protocols. The following normative CPCM Specification elements published in this second revision of Blue Book A094 form the complete set of core elements of the CPCM system: Part 1: CPCM Abbreviations, Definitions and Terms Part 2: CPCM Reference Model Part 3: CPCM Usage State Information Part 4: CPCM System Specification Part 5: CPCM Security Toolbox Part 6: CPCM Security Test Vectors Part 7: CPCM Authorised Domain Management Part 8: CPCM Authorised Domain Management scenarios Part 9: CPCM System Adaptation Layers Part 10: CPCM Acquisition, Consumption and Export Mappings At a future date DVB will publish three supporting informative documents which explain the rational behind the specification and provide guidance for implementers: Part 11: CPCM Content management scenarios Part 12: CPCM Implementation Guidelines Part 13: CPCM Compliance Framework Signaling to CPCM The DVB has updated the Service Information specifications (ETSI EN 300 468: “Specification for Service Information (SI) in DVB Systems”) Signaling has been added for the attention of content protection and copy management systems such as DVB-CPCM but also possibly for other systems. This signaling is a limited set of flags to be used for FTA broadcasts. The associated Mapping into the CPCM system after Acquisition is defined in “Part 10 CPCM Acquisition, Consumption and Export Mappings”. Alternatively the full range of CPCM USI could be used as a signaling mechanism which can be mapped to the appropriate CPCM USI at the CPCM Acquisition Point. This would be used, for example, if the limited set of FTA flags is not comprehensive enough for a particular application. CPCM Compliance Interoperability of secure content transfer and adherence to Usage State Signals between CPCM devices requires that all CPCM devices conform to the requirements and rules of a technical compliance regime. Where relevant there are references in the documents to such “a CPCM Compliance Regime”. Details regarding implementations and associated compliance requirements will be reflected in the relevant CPCM compliance regime. Guidance is given in “Part 13 CPCM Compliance Framework”. CPCM is designed to accommodate a variety of business models. The existence of any particular field of USI does not imply that it will be asserted by a particular business, or that it will be allowed to be asserted, or that a particular implementation will require the full functionality described in the Reference Model.
For those seeking only a brief overview of the DVB-CPCM specification the following Fact Sheet may be more appropriate.
The following FAQ document addresses some specific questions which have been addressed to the DVB Project regarding the DVB-CPCM specifications. It is designed to complement the Fact Sheet above.
For articles tracing the development of the CPCM specifications, please see previous issues of DVB-Scene magazine. The article index can be searched here. |
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