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US07035200B2 Optical disk copy-protection using an optically changeable security material 失效
使用光学可变安全材料的光盘复制保护

Optical disk copy-protection using an optically changeable security material
摘要:
A method and system for providing copy-protected optical medium using a substrate having information stored thereon in information pits and information lands, wherein the information lands comprise lands in two different planes.
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