2.1.1.6.3 Revocation

Prior to initiating registration, the receiver MUST send the transmitter device a revocation information version (RIV) structure and the WMDRM: Network Devices Protocol CRL as defined in section 2.2.1.6. These messages are sent over UPnP. In addition to the policies specified in this document, the transmitter MUST ensure that the Issue Time of the RIV is current as defined by the Compliance and Robustness Rules for Windows Media DRM [CR-WMDRM].