Patent ID: 8565420

Claim:
A sanction server for cryptographic sanctioning of secure transmission of media content from a content source, via a caching server to at least one client device, the sanction server comprising: a network interface that provides bidirectional data communication with the content source, the caching server and the at least one client device via at least one network, wherein the network interface receives proxy data from the content source that includes cryptographic parameters that are based on a scrambling control word used to scramble the media content, receives a request for the media content from the at least one client device, transmits the proxy data to the at least one client device and transmits notification data to the caching server; a random number generator that generates the scrambling control word; a source processing module, coupled to the random number generator, that generates the proxy data and cryptographic data based on the scrambling control word; wherein the content source generates the cryptographic data and sends the cryptographic data and the scrambled media content to the caching server; wherein the caching server forwards the cryptographic data and the scrambled media content to the at least one client device; wherein the at least one client device generates the scrambling control word for descrambling the scrambled media content based on the proxy data and the cryptographic data; and wherein the proxy data, the cryptographic data and the scrambling control word are generated in accordance with an asymmetrical public key cryptography algorithm.