Viaccess

Sébastien Le Henaff

Olivier Granet

Pascal Danois

Security processor () for a decoder able to receive a scrambled multimedia signal, this processor comprising: &#x2014;at least one first rewritable lock (FIELDKEY, FIELDPIEMM, FIELDPIEMMC, FIELDPIECM, FIELDFCT) whose value can be toggled between a first and a second predetermined value in response to an EMM or ECM message, &#x2014;a restriction function able to authorize and, alternately, prohibit, as a function of the value of the first lock, only one particular operation of the security processor, this particular operation being chosen from the group composed of: the use of a cryptographic key, the processing of a parameter contained in an EMM or ECM message received, and the execution of an elementary conditional access function of the code of the application.

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Fontenay le Fleury, France

Sébastien Le Henaff