Methods and apparatus for providing a partial dual-encrypted...

Details Methods and apparatus for providing a partial dual-encrypted... Methods and apparatus for providing a partial dual-encrypted...

H - Electricity

04

L

H04L 9/00 (2006.01)

Patent

CA 2544623

The present invention is directed towards providing a partial dual-encrypted stream in a conditional access overlay system. The headend equipment includes an aligner, identifier, and remapper (AIR) device (615) that receives a clear stream and one or two encrypted streams, where the two encrypted streams have been encrypted by two different encryption schemes. The AIR device (615) identifies critical packets associated with the clear stream and subsequently allows two encrypted streams to pass and drops the critical packets of the clear stream. A multiplexer (640) then combines a percentage of the non-critical packets of the clear stream and the critical packets of the two encrypted streams to provide the partial dual-encrypted stream.

L'invention concerne la création du flux à cryptage double partiel dans un système à recouvrement d'accès conditionnel. L'équipement à tête de station comprend un aligneur, un identificateur, un dispositif de remappage (AIR) (615) qui permet de recevoir un flux non crypté et un ou plusieurs flux cryptés, le deux flux cryptés ayant été cryptés au moyen de deux schémas de cryptage différents. Le dispositif AIR (615) identifie des paquets critiques associés au flux non crypté, puis permet aux deux flux cryptés de passer et de lâcher les paquets critiques du flux non crypté. Un multiplexeur (640) combine ensuite un pourcentage de paquets non critiques du flux non crypté et les paquets critiques des deux flux cryptés afin de fournir un flux à cryptage double partiel.

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