Limited Play Optical Discs
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United States of America Patent
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N/A
Issued Date -
Mar 19, 2009
app pub date -
Jul 18, 2008
filing date -
Jul 24, 2007
priority date (Note) -
Abandoned
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Abstract
An optical disc having machine-readable, information encoding features includes a coating comprising a tellurapyrylium dye irreversibly bleachable by light. The dye, once bleached, is operative to change the index of refraction of the dye to inhibit reading of the information encoding features.
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