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Abstract

A method for protecting content to be distributed to a pool of receiving terminals connected to a content distribution network and each having a specific security level depending on the technical securing means used, the method comprising the following steps:

when sending, generating a key for scrambling said content,transforming said scrambling key using a first calculation module 26 arranged at the headend of said content distribution network,scrambling the content using the transformed key,transmitting the scrambled content and the scrambling key to the terminals, and,upon reception of said content and of the scrambling key by a terminal,transforming said scrambling key using a second calculation module arranged in said terminal,descrambling the content with the transformed scrambling key, the method also characterized by the steps consisting of,when sending, applying to said scrambling key, by means of said first calculation module, a function F defined according to the specific security level, and when receiving,applying to said scrambling key, by means of said second calculation module, a function F defined according to the specific security level.

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First Claim