Anti-copying methods and devices for digital information...

Details Anti-copying methods and devices for digital information... Anti-copying methods and devices for digital information...

G - Physics

11

B

G11B 20/00 (2006.01) H04H 1/00 (2006.01)

Patent

CA 2331111

In order to protect audio signals against copying, it is proposed to mix the audio signal with at least one non-audible disturbance signal. A first disturbance signal may be a low-frequency signal which is added to the audio signal, while a second disturbance signal may be a high-frequency disturbance signal which is multiplied with the audio signal. Additionally, the second disturbance signal may be modulated by a modulating signal comprising either the original or inverted orginal signal, or spoken messages indicative of an illegal copy. Additionally, or alternatively, digital information may be copy protected by briefly interrupting the writing of the information to an information carrier. The latter measure is also effective for copy protecting software.

Afin de protéger les signaux audio contre le piratage, cette invention propose de mélanger le signal audio à au moins un signal perturbateur inaudible. Un premier signal perturbateur peut être un signal basse fréquence qui est ajouté au signal audio, tandis qu'un second signal perturbateur peut être un signal perturbateur haute fréquence qui est multiplié avec le signal audio. De plus, le second signal perturbateur peut être modulé par un signal modulateur comprenant soit le signal d'origine ou le signal d'origine inversé, soit des messages vocaux indiquant une copie illégale. D'autre part, ou selon une autre variante, les informations numériques peuvent être copiées en interrompant brièvement l'enregistrement des informations sur un support d'informations. Cette dernière mesure est également efficace pour protéger le logiciel contre le piratage.

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