Patent ID: 8600062

Claim:
A method of issuing protected content, comprising: symmetrically pre-encrypting the content; receiving a request to issue content for playback on at least one playback device associated with a user account, where each playback device includes a processor containing a private key assigned to the playback device by a conditional access system and where the conditional access system issues device certificates including a public key for each playback device; generating a content key and over-encrypting at least a portion of the symmetrically pre-encrypted content using the content key in response to the request; obtaining a public key for each playback device; encrypting at least one copy of the content key using the public key of each playback device associated with the user account; delivering the over-encrypted content and the at least one encrypted copy of the content key to a playback device associated with the user account; and writing the device certificate of each playback device associated with the user account to a portable media drive; wherein obtaining a public key for each playback device further comprises obtaining a public key for each playback device from the portable media drive; and wherein delivering the over-encrypted content and the at least one encrypted copy of the content key to a playback device associated with the user account comprises writing the over-encrypted content and the at least one encrypted copy of the content key to the portable media drive.