| 摘要 |
FIELD: copy protection. ^ SUBSTANCE: control data are encoded on a CD. Copy protection method includes stage of playback of selected control data incorrectly and/or non-precisely. Said control data are inaccessible or not readable at all by sound player, which only can play sound data. Wrong control data make sound data absolutely not readable by data reading device. Copy-protected CD with digital sound record contains audio data and control data, encoded in above-mentioned way. ^ EFFECT: higher efficiency. ^ 2 cl, 7 dwg |
