| 摘要 |
<p>The invention enables a chip set of a receiver of a conditional access system to receive control words securely from a head-end system in the content delivery network. Hereto the chip set comprises means for processing an incoming message to obtain a virtual control word, and using the virtual control word to generate the control word used for descrambling content received from the content delivery network. The authenticity of incoming messages is verified, in the sense that content descrambling fails if an incoming message is not authentic.</p> |
