| http://www.w3.org/ns/prov#value | - message to the descrambler carries at least one cryptogram, the conditional access sub-system being configured to generate the cryptogram by encrypting under a channel key data obtainable from at least one content descrambling key in the message, wherein the conditional access sub-system is configured to use a second key to establish the channel key, wherein the second key is a secret key of an a
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