Unit and method for securely processing audio/video data with controlled access

摘要

The method involves generating an output (S1) from a cryptogram (CW1') when verification of right enforcement parameters (C1) with respect to a content of a memory (M1) of an access control device (CA1) is positive. Right enforcement parameters (C2) are received by an access control device (CA2) that is integrated in a processing unit (UT). An output (S2) is obtained on a base of the parameters (C2) and a content of a memory (M2) of the device (CA2). The two outputs are combined for obtaining a control word (CW). An independent claim is also included for a secured processing unit for digital audio/video data broadcasted with a controlled access, comprising a loaded calculation module.