Patent ID: 8559629

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