Patent ID: 8315392

Claim:
A method to secure the reception of a broadcast content managed by a control center and encrypted by at least one transmission key or a datum allowing to recover said transmission key and transmitted to at least one decoding unit, said decoding unit having at least one environment parameter known by the control center, said method comprising the following steps, executed by a processor of the decoding unit: receiving from the control center a first message common to a plurality of decoding, units comprising the encrypted transmission key; receiving from the control center a second message pertaining to said decoding unit the second message comprising correction data, said correction data being based on the at least one environment parameter of the decoding unit; determining by the decoding unit at least one environment parameter of the decoding unit, said environment parameter being selected from among the group of parameters consisting of: a software version of said decoding unit; configuration data of a hardware module of said decoding unit; status information of a hardware module of said decoding unit; a certificate stored in said decoding unit; a hash function of all or part of the software of said decoding unit; a location indication of the decoding unit; a hardware address of a local network interface of said decoding unit: an identification number of one of the hardware devices of said decoding unit; identification data of a peripheral of said decoding unit; and any combination of any of the foregoing; and decrypting the encrypted transmission key using the environment parameter and the correction data.