| 摘要 |
<p>The invention concerns a method for revoking access rights to an audio-visual programme received by a decoder (11) comprising the following steps: transmitting first messages (ECM) containing encrypted control words, each control word (CW) being used to descramble for a given time period the audio-visual signal received, second messages (EMM) comprising each data allocating user rights; decrypting in the decoder, or a portable object associated therewith, the first messages to produce control words (CW) for descrambling said audio-visual signal received by the decoder (11), transmitting third hybrid messages resulting each from the combination of at least one encrypted control word (CW), a decoder address and a right revoking information.</p> |
