| 摘要 |
An optical medium piracy method and system employing a ultraviolet-sensitive state-change material capable of changing state upon activation with a wavelength of ultraviolet between 253+/-25 nm to 365+/-25 nm, the state-change material in association with digital data indicia, wherein when the state-change material is activated to change state by the ultraviolet radiation, the optical medium moves from an unreadable to a readable condition, or from a less readable to more readable condition.
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