Patent ID: 7848521

Claim:
A method for receiving and storing of scrambled content in which the scrambled content is received together with encrypted control words, control words being used for descrambling the scrambled content, comprising the steps of: receiving, by a receiver/decoder, the scrambled content and encrypted control words, said control words being encrypted by an exploitation key (K G ); decrypting said encrypted control words in a removable security module with the exploitation key (K G ), said removable security module being received by the receiver/decoder; receiving, by the receiver/decoder, a usage rules message (URM) comprising usage rules and corresponding to the scrambled content, wherein the usage rules included within the URM depend upon the scrambled content, independent of a number of recordings by the receiver/decoder, and impose usage constraints that restrict the playback and reproduction of a descrambled version of the scrambled content stored on a mass storage device, and wherein the URM is stored on the mass storage device; encrypting the decrypted control words and the URM by a local key (K L ) to produce an encrypted control management message (CMM), wherein the CMM comprises: the URM, the control words extracted from an entitlement control message (ECM), and an Entitlement Management Message (EMM) comprising access rights associated with a user for playback and recording of the scrambled content, wherein the CMM is encrypted as a single data unit; and storing said scrambled content and said encrypted control management message (CMM) in different files on the mass storage device of the receiver/decoder.