| 摘要 |
A method and associated apparatus providing copy protection for compact disks are disclosed. In accordance with this invention, otherwise conventional compact disks include a "signature" which is a special sequence of bits. When the signature is detected on a compact disk being played, in response the compact disk player allows playing program material on the compact disk. Thus the signature acts as a copy protection mechanism whose presence is required before playing. The signature bits are located anywhere on the compact disk that is readable by the associated player.
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