Importance

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Abstract

A method for transmission and storing of scrambled content in which the scrambled content is transmitted together with encrypted control words, the control words being used for descrambling the scrambled content, transmitting to a receiver/decoder the scrambled content and encrypted control words, said control words being encrypted by an exploitation key (K.sub.G), decrypting said encrypted control words in a removable security module with an exploitation key (K.sub.G), said removable security module being received by the receiver/decoder, characterised in that it further includes transmitting usage rules message (URM) to the receiver/decoder (2000), which usage rules (URM) impose usage constraints on the playback of the content stored on a mass storage device encrypting the decrypted encrypted control words and usage rules messages by a local key (K.sub.L) to produce encrypted control management messages (CMM) storing said scrambled content and encrypted control management message on the mass storage device of the receiver/decoder.

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First Claim