A partial dual-encrypted stream utilizing program map tables

H - Electricity – 04 – N

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H04N 21/2389 (2011.01)

Patent

CA 2530276

The present invention is suitable for use in a partial dual encrypted system. The present invention allows for two different decryption devices (e.g., an incumbent, or first, set-top and an overlay, or second, set-top) to be located in a single system having an incumbent encryption scheme and a second encryption scheme. Each set-top is designed to decrypt the first or second proprietary encryption schemes, respectively. In accordance with the present invention, the second set-top utilizes a novel program map table to ensure that the second set-top chooses correct elemenentary streams in the partial dual-encrypted stream (i.e., a combined stream including a first encrypted stream, a second encrypted stream, and a clear stream) for a desired program.

Cette invention est conçue pour être utilisée dans un système à double codage partiel. Cette invention permet de placer de dispositifs de codage différents (par exemple un premier décodeur ou décodeur titulaire et un second décodeur ou décodeur superposé) dans un seul système présentant un schéma de codage titulaire et un second schéma de codage. Chaque décodeur est conçu pour décoder le premier ou le second schéma de codage propriétaire, respectivement. Selon cette invention, le second décodeur utilise une nouvelle table d'index de programmes pour s'assurer que le second décodeur choisisse les séquences continues élémentaires correctes dans la séquence continues à double codage partiel (c'est-à-dire une séquence continue combinée contenant une première séquence codée, une seconde séquence codée et une séquence en clair) pour un programme souhaité.

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