| 摘要 |
<p>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.</p> |
