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CGMS-A Standards

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The Copy Generation Management System - Analog (CGMS-A) is a copy protection system for analog video signals. Various countries and regions use different versions of CGMS-A. A hardware vendor must ensure that their display miniport driver supports the appropriate CGMS-A version.

For example, a driver for a graphics adapter to be used in Japan should probably support the Association of Radio Industries and Businesses (ARIB) TR-B15 standard, which is the operational guideline for digital satellite broadcasting. However, a driver for a graphics adapter to be used in the United States should support the International Electrotechnical Commission (IEC) 61880 standard or the Consumer Electronics Association (CEA) CEA-608-B standard. The standard that a graphics adapter's display miniport driver supports depends on the type of signal that the adapter transmits.

The following list describes various standards that define CGMS-A. Redistribution control is defined only in the CEA-805-A standard.

  • CEA-805-A

    • Data on Component Video Interfaces
    • Defines how CGMS-A and redistribution control information should be encoded in an analog 480p, 720p, or 1080i signal that is transmitted from a component video output (Y/Pb/Pr output).
    • This standard is published by the Consumer Electronics Association (CEA).

  • CEA-608-B and EIA-608-B

    • Line 21 Data Services
    • Defines how CGMS-A information should be encoded in a 480i signal that is transmitted from an RF, composite, or S-Video output.
    • This standard is published by CEA and Electronic Components Industry Association (ECIA).

  • EN 300 294 V1.3.2 (1998-04)

    • Television systems; 625-line television - Wide Screen Signaling (WSS)
    • Defines how CGMS-A should be encoded in a 576i Phase Alternation Line (PAL) or Sequential Color with Memory (SECAM) signal.
    • This standard is published by the European Telecommunications Standards Institute (ETSI).

  • IEC - 61880 - First edition - Video systems (525/60)

    • Video and accompanied data using the vertical blanking interval - Analog interface
    • A method of encoding CGMS-A information in a 480i video signal that is transmitted from an analog or digital video output.
    • This method is published by International Electrotechnical Commission (IEC).

  • IEC - 61880-2 - First edition - Video systems (525/60)

    • Video and accompanied data using the vertical blanking interval - Analog interface - Part 2: 525 progressive scan system
    • A method of encoding CGMS-A information in a 480p video signal that is transmitted from an analog or digital video output.

  • IEC - 62375 - Video systems (625/50 progressive)

    • Video and accompanied data using the vertical blanking interval - Analog interface
    • A method of encoding CGMS-A information in a 576p video signal that is transmitted from an analog or digital video output.

  • ARIB TR-B15

    • Operational Guideline for Digital Satellite Broadcasting
    • Defines how CGMS-A information should be encoded in an analog 480i, 480p, 720p, or 1080i signal that is transmitted from a video output.
    • This standard applies only to Japan.
    • This standard is published by the Association of Radio Industries and Businesses (ARIB).