Patent ID: 8401190

Claim:
A method for pairing a decoder and a portable security module in a broadcasting network, comprising: selecting a first key, the first key being unique in the broadcasting network and being dedicated to a single device in the broadcasting network; assigning the first key to the decoder, wherein the decoder and the portable security module form a first receiving decoding system among a plurality of receiving decoding systems in the broadcasting network, wherein each receiving decoding system is configured to descramble scrambled audiovisual data received via the broadcasting network; determining a second key according to the first key, such that a combination of the first key and the second key is congruent to a pairing system key, wherein the pairing system key is common to each receiving decoding system and allows for decryption of encrypted control data, the encrypted control data being identical for each receiving decoding system; assigning the second key to the portable security module to obtain a pairing of the decoder and the portable security module; wherein the control data enables to descramble the scrambled audiovisual information, the method further comprising: receiving, at the first receiving decoding system, the encrypted control data; using the first key at the decoder and using the second key at the portable security module to decrypt the encrypted control data; and further comprising respectively attributing the first key and the second key at least to a second decoder and a second portable security module forming a second receiving decoding system from the plurality of receiving decoding systems distinct from the first receiving decoding system.