Anti-chipping recording disc, reading method and recording head
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United States of America Patent
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Jun 10, 2003
Grant Date -
Sep 26, 2002
app pub date -
May 25, 1999
filing date -
Sep 26, 1997
priority date (Note) -
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status (Latency Note)
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Abstract
An anti-piracy recording disk. The disk includes a main recording track which has interruptions or changes of turn. This gives rise to non-sequential reading and therefore to information which is difficult to access. The copying of such a disk by conventional means is very difficult making it possible to easily detect counterfeits or to render any copy unusable.
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