Content protection for transmission systems

Abstract

A method for protecting digital content from copying and/or other misuse as it is transferred between devices over insecure links, includes authenticating that both a content source and a content sink are compliant devices, establishing a secure control channel between the content source and the content sink, establishing a secure content channel, providing content keys, and transferring content. In a further aspect of the present invention, at least one certificate revocation list version identifier is exchanged between the content source and the content sink, and if the received certificate revocation list version identifier is more recent than the certificate revocation list version identifier stored in the receiving device, then the certificate revocation list of the receiving device is updated.

Dependencies are inferred from the claim text.