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Abstract

The invention concerns a device for processing a signal comprising a signal transforming module (5) capable of producing a transformed signal (xi) from an original signal and a mixing module (10) for marking the transformed signal with a marking message (M). The mixing module (10) comprises: a formatting module (14) capable of calculating a response of the transformed signal (rx) to the demodulation of a first set of carriers (Gj) defined by keys protecting the message and of calculating a marking information ({bj}) based on said response and code words (U) associated with the marking message, a modulator (18) capable of modulating marking data supplied by the formatting module (14) with a given coefficient (Gij) of the carriers of the first set of carriers, and of modulating in amplitude the resulting coefficient by a corresponding quantity related to the energy weighting term of the marking message and to the set of carrier, thereby supplying a marking coefficient, an adder (20) capable of adding the marking coefficient to the corresponding coefficient of the original transformed signal.

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First Claim