| 摘要 |
PURPOSE: An optical disc with an illegal copy protection function is provided to effectively prevent illegal copy by complementary identification features which are respectively formed on the main and sub discs. CONSTITUTION: A main disc(10) has a center portion, a hole formed through the center portion, and a first identification feature. A sub disc(20) is removably fitted into the hole of the main disc and has a second identification feature corresponding to the first identification feature. The first and the second identification feature are complementary to each other so as to form a pattern when the sub disc is fitted into the main disc.
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