Patent ID: 8185475

Claim:
A device initialization method comprising: transmitting a license request for a personal media device to a media distribution system, the personal media device being associated with a subscription; receiving a device license for the personal media device from the media distribution system responsive to transmitting the license request, the device license including, a licensing service digital certificate including a licensing service public key, a user encryption key, a system time indicator configured to indicate the system time as defined by a media distribution system, and a digital signature; verifying the integrity of the device license using the digital signature and the licensing service digital certificate; determining whether the subscription associated with the personal media device has expired using a system clock associated with the personal media device, the system clock being synchronized with a system time of the media distribution system using the system time indicator; providing for rendering media content of the media distribution system on the personal media device when the integrity of the device license is verified and the subscription associated with the personal media device has not expired.