| 摘要 |
A system for selectively inhibiting unauthorized use of an optical device. In an illustrative embodiment, the system implements an optical-device play-prevention system and copy-prevention system. The system includes a first set of data that is encoded via pit structures of the optical disc. A read system, such as a disc drive, which includes a read laser, is adapted to read the first set of data. A first material, which is positioned on or within the disc, changes transparency to laser light from the read laser in response to a first predetermined energy, such as ultrasound. A second material that is positioned on or within the disc temporarily changes transparency to the laser light, in response to a second predetermined energy, such as energy from the read laser. Changes in transparency of the first material and the second material change accessibility of the first set of data to the read system. The system further includes instructions executable by the read system for enabling or disabling reading, playing, and/or copying of the optical disc by the read system based on the accessibility of the first data to the read system.
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