| 摘要 |
PURPOSE: A method for preventing unauthorized use of optical discs is provided to prevent the unauthorized use of optical discs. CONSTITUTION: An optical-disc writer writes extrinsic data(310) to an optical disc. Extrinsic data can be written as embedded marks located outside the conventional readable area of a disc and/or alternative marks, such as surface marks located on a surface of the disc. In an optical-disc player having a disc-reading subsystem and a read controller, the disc-reading subsystem reads and relays the extrinsic data to the read controller, which controls the operations of the player based on the extrinsic data. The disc is inserted in the player and installation is commenced. The read controller instructs the disc-reading subsystem to read the extrinsic information. If the read controller determines that the extrinsic data was successfully read, then installation proceeds; otherwise, installation is halted.
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