Patent ID: 8452009

Claim:
A method for processing control messages from a set of control messages intended to access an encrypted content received in the form of a stream by a multimedia unit of a user, the control messages to be processed including at least a discrimination parameter having a different value for non-redundant messages in the stream and data for accessing encrypted content, the method comprising steps of: receiving by the multimedia unit a current control message in a broadcast stream; reading in the multimedia unit a discrimination parameter from the current control message; retrieving in a memory of the multimedia unit a discrimination parameter from a control message processed previously to the current message; comparing the current message discrimination parameter with the previously processed message discrimination parameter; and eliminating during input processing of the received broadcast stream said current control message from the multimedia unit by a filter of the multimedia unit if the comparison step indicates that the discrimination parameter of the current message is identical to the discrimination parameter of the previously processed message; wherein the discrimination parameter is unique and different for each message of a non-redundant subset of the ordered set of control messages, this subset containing at least three control messages and at the most all the control messages of the set of messages, in such a way that, during the filtering step, the current message and the previously processed message can be non-consecutive in the ordered subset of messages.