Audio encoded analog remastering.; Apart from the classic protection systems anticopy methods, the invention is based on the anti-replay by sound coding on the CD master that all copies made thereof will double, so that said coding generates digital alterations in both the phase and frequency and amplitude of the sound, making it totally deformed unpleasant to the human ear, a subsequent decoding being required to access your normal hearing. To said decoding a key (5) incorporating the decoder, provided with a, plug in the outlet (6) for the player team headphones (7), key (5) male terminal (3) type "jack" provided to use turn your own outlet (4) for these headphones, so that without the support of the key (5) it is impossible to correct hearing reproduced audio support, said key (5) specific for each original CD.
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