| 摘要 |
The invention relates to a method for protecting content (6) scrambled by a content key (CW) transmitted in an encrypted form using a content-access key (K), said content being provided by a transmission system to at least one reception terminal (4) using a locally configured service at said reception terminal according to a set of properties Pi, where i = 1 to N, known by the transmission system, each of said properties Pi being represented by a piece of data Xi stored in said transmission system and by a local piece of data Y1 that is read-accessible by said terminal, characterized in that it comprises upon transmission a step of over-encrypting said content key CW using at least one reversible over-encrypting function fi (Xi) that is dependent on at least one of the properties Pi, where i = 1 to n. |
