Limited use DVD-video disc
作者： Bhaskar Venepalli , Ralph LaBarge , Merrill Solomon
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摘要: A limited-use Digital Versatile Disc (DVD) includes a storage layer for storing content data and control key data. At least one mark of photosensitive dye is disposed on the disc exterior to over at portion In embodiment, initially transparent allow DVD player read The changes from clear become opaque when it exposed reader laser light cumulative period time. This change in optical property configuration prevents further reading after predetermined playback usage some permitted. another prevent successful data, permanently
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