Hologram printed on optical recording medium for copy protection
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United States of America Patent
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Dec 24, 1996
Grant Date -
N/A
app pub date -
Sep 8, 1995
filing date -
Sep 13, 1994
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An optical recording medium is disclosed, in which holograms for recording medium discrimination are recorded in a recording medium discrimination information recording area provided on the side of an inner circle within an information recording area on a compact disc. Thus, it is difficult to copy an original optical recording medium to produce a fake product, and it is possible to distinguish the original optical recording medium from the fake product by external appearance.
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