| 摘要 |
<p>A method and a system of transmitting one or more control words to a receiver system is described, wherein the one or more control words are generated by a scrambling system for scrambling during a crypto period data packets in a service stream. The method involves transmission of at least one service stream and a stream of entitlement control messages associated with said service stream to the receiver system, each entitlement control message comprising at least one encrypted control word; and controlling the processing load of the receiver system by modifying the duration of said crypto period.</p> |
