Patent ID: 7231516

Claim:
In a multimedia recording and playback network for receiving from a content server a service package of multimedia content, the network including a media server in communication with the content server, a method of securely transmitting a master encryption key from the content server to the media server, including the steps: downloading a service package certificate from the content server to the media server; the media server authenticating the received service package certificate; the content server providing to the media server a key server certificate, a public key of the content server, and a client certificate request; the media server authenticating the key server certificate; providing to the content server, upon authentication of the key server certificate by the media server, a client certificate including a challenge signature, and a public key of the media server; the content server authenticating the client certificate including the challenge signature received from the media server; the media server requesting the master encryption key from the content server; and the content server responding by transmitting the master encryption key to media server.