Providing control words to a receiver

H - Electricity – 04 – N

Patent

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Details

H04N 7/16 (2011.01)

Patent

CA 2755659

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.

L'invention concerne un procédé et un système de transmission d'un ou de plusieurs mots de commande à un système récepteur; lesdits mots de commande sont générés par un système de brouillage pour brouiller pendant une cryptopériode de paquets de données dans un flux de service. Le procédé implique la transmission d'au moins un flux de service et d'un flux de messages de commande d'admissibilité associés audit flux de service au système récepteur, chaque message de commande d'admissibilité comprenant au moins un mot de commande chiffré; et commandant la charge de traitement du système récepteur par modification de la durée de ladite cryptopériode.

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