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Determining the Protection Level for a Physical Output

Last Updated: 2/14/2017

You should use the algorithms in the following sections to determine the protection level for a physical video output connector. These algorithms are represented in pseudocode.

Algorithm for Protection Level

You should use the following algorithm to determine the protection level value for a physical video output connector:

  1. For each protection type (ACP, CGMS-A, HDCP, and DPCP) that the physical output connector supports, perform the following steps:

    1. Set the proposed protection level to no output protection. For example, for ACP, a driver should set the protection level to DXGKMDT_OPM_ACP_OFF; for CGMS-A, a driver should set the protection level to DXGKMDT_OPM_CGMSA_OFF; for HDCP, a driver should set the protection level to DXGKMDT_OPM_HDCP_OFF; and for DPCP, a driver should set the protection level to DXGKMDT_OPM_DPCP_OFF.
    2. For each protected output that is associated with the physical output connector, perform the following steps:

      1. Retrieve the current protected output's protection level for the current protection type.
      2. If the current protection type is CGMS-A, remove the DXGKMDT_OPM_REDISTRIBUTION_CONTROL_REQUIRED flag if the flag is set.
      3. End if
      4. If the current protected output's protection level has a higher precedence than the proposed protection level, set the proposed protection level to the current protected output's protection level.
      5. End if
    3. End for

    4. Set the physical output's protection level to the proposed protection level.
  2. End for

Algorithm for Redistribution Control

You should use the following algorithm to determine if a physical output connector must enable redistribution control:

  1. For each protected output that is associated with the physical output connector, perform the following steps:

    1. Retrieve the information on whether the current protected output's redistribution control flag is set.
    2. If the DXGKMDT_OPM_REDISTRIBUTION_CONTROL_REQUIRED flag is set, perform the following steps:

      1. Enable redistribution control.
      2. Stop executing the algorithm.
    3. End if

  2. End for

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