pay tv method to deprive of rights in such a system, associated decoder and smart card, and a message transmitted to such decoder

摘要

The present invention relates to a process for the revocation of access rights to an audiovisual programme received by a decoder (11) comprising the steps: - of the transmission of messages (ecm) containing the control words encrypted, each control word (cw) is used for descrambling for a given period of time the audiovisual signal received and second messages (emm), each comprising information for the allocation of the user rights, - of decryption in the decoder, or a portable object, which is associated with it, the first message in order to produce the control word (cw) to the descrambling of the audiovisual signal received by the decoder (11), - of the transmission of messages hybrid third each resulting from the combination of at least one control word encoded, of an address decoder and a revocation.