Partial encryption of assembled bitstreams

H - Electricity – 04 – K

Patent

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H04K 1/00 (2006.01) H04N 7/167 (2006.01)

Patent

CA 2436678

An encoded bitstream assembled by an audio or video encoder is encrypted. The assembled encoded bitstream has a syntax. Data is selected in the assembled encoded bitstream, which data is less than all of the data in the bitstream and which, if encrypted, would result in a partly-encrypted bitstream that does not violate the syntax of the assembled encoded bitstream and would render reproduced audio or video resulting from an undecrypted decoding of the partly-encrypted bitstream to be of degraded quality. The selected data in the assembled encoded bitstream is encrypted to provide the partly encrypted bitstream.

L'invention concerne le cryptage d'un train de bits codé et assemblé par un codeur audio ou vidéo. Le train de bits codé et assemblé présente une syntaxe. Des données sont sélectionnées dans le train de bits codé et assemblé; ces données font moins que toutes les données dans le train de bits et, si elles sont cryptées, donneraient un train de bits partiellement crypté respectant la syntaxe du train de bits codé et assemblé et de l'audio ou de la vidéo reproduite issus d'un décodage non décrypté du train de bits partiellement crypté de qualité dégradée. Les données sélectionnées dans le train de bits codé et assemblé sont cryptées de manière à obtenir le train de bits partiellement crypté.

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