Security processor and recording method and medium for configuring the behaviour of this processor
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United States of America Patent
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May 3, 2016
Grant Date -
Jul 1, 2010
app pub date -
Aug 29, 2007
filing date -
Aug 30, 2006
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Abstract
Security processor (42) for a decoder able to receive a scrambled multimedia signal, this processor comprising: —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, —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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