Conditional access system for digital receivers

Details Conditional access system for digital receivers Conditional access system for digital receivers

H - Electricity

04

N

H04N 7/16 (2006.01) H04N 7/167 (2006.01)

Patent

CA 2318939

A method for providing conditional access (i.e., managing access) to a received scrambled audio/visual (A/V) signal from a variety of sources by utilizing secret sharing for key recovery. Secret sharing eliminates the necessity to protect and transfer the complete descrambling keys between devices, because a portion of the key is stored in the device or a smart card coupled thereto.

L'invention porte sur un procédé permettant un accès conditionnel (par exemple gestionnel) à des signaux audio/visuels (A/V) cryptés reçu de diverses sources et utilisant un partage secret pour reconstituer le code. Le partage secret élimine la nécessité de protéger et transférer la totalité des codes de décryptage entre les dispositifs, puisqu'une partie de chaque code est stockée dans le dispositif ou dans une carte à puce lui étant reliée.

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