Setting the HDCP SRM Version

  • Article

OPM configuration can set the version of the High-bandwidth Digital Content Protection (HDCP) System Renewability Message (SRM) for the protected output. To set the version, the display miniport driver's DxgkDdiOPMConfigureProtectedOutput function receives a pointer to a DXGKMDT_OPM_CONFIGURE_PARAMETERS structure with the guidSetting member set to the DXGKMDT_OPM_SET_HDCP_SRM GUID and the abParameters member set to a pointer to a DXGKMDT_OPM_SET_HDCP_SRM_PARAMETERS structure. The DXGKMDT_OPM_SET_HDCP_SRM_PARAMETERS structure contains a ULONG that specifies the version number. The least significant bits (bits 0 through 15) contain the SRM's version number in little-endian format. For more information about the SRM version number, see the HDCP Specification Revision 1.1.