Optical recording medium having a non-volatile identification code and method for encoding data using same
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United States of America Patent
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Aug 26, 1997
Grant Date -
N/A
app pub date -
Mar 21, 1996
filing date -
Jun 27, 1995
priority date (Note) -
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Abstract
An optical recording medium in which a medium identification code is recorded by using a nonvolatile mark which is formed through irreversible change of a recording film, such as magnetization characteristic change, deformation and formation of a hole, so as to prevent illegal copy of the optical recording medium, and a recording/reproducing method for the same.
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