H - Electricity – 04 – N
Patent
H - Electricity
04
N
H04N 7/167 (2006.01) H04N 7/16 (2006.01) H04N 7/173 (2006.01)
Patent
CA 2382701
A video-on-demand service is facilitated by encrypting, before purchase requests by subscribers, content such as a movie in accordance with one or a series of control words protected by a program key. The transport mechanism for delivery is an MPEG compliant transport mechanism, and the program key is encrypted and contained in an entitlement control message (ECM). The ECMs are transmitted to the set-top terminal associated with the subscriber for a limited time defining a service acquisition window. Thereafter, transmission of some or all ECMs are suppressed. This reduces the likelihood that an unauthorized terminal will intercept the ECM containing the program key, which is needed to descramble the content.
Cette invention concerne un service vidéo à la demande facilité par le cryptage, préalablement aux demandes d'achat en provenance d'abonnés, de contenus tels qu'un film conformément à un ou à plusieurs mots de commande protégés par une clé de programmes. Le mécanisme d'acheminement est du type MPRG, la clé de programmes étant cryptée et contenue dans un message de commande d'admissibilité (entitlement control message/ECM). Le message ECM est transmis au décodeur de l'abonné pendant un laps de temps limité correspondant à une fenêtre d'acquisition de services. Ensuite, la transmission de certains ou de tous les messages ECM est arrêtée. On réduit ainsi les risques de voir un terminal non autorisé intercepter le message ECM qui renferme la clé de programmation requise pour désembrouiller le contenu.
General Instrument Corporation
Gowling Lafleur Henderson Llp
LandOfFree
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