Machine-readable optical disc with reading-inhibit agent
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United States of America Patent
Stats
-
Aug 13, 2002
Grant Date -
Nov 29, 2001
app pub date -
Jun 22, 2001
filing date -
Sep 16, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An optical disc having machine-readable, information-encoding features is provided with a barrier layer secured to the disc. This barrier layer is configured to prevent machine-reading of the features. A reading-inhibit agent, included in the disc and activated by removal of the barrier layer, is operative, once activated, to alter the disc to inhibit reading of the disc. Alternately, the barrier layer can be eliminated, and the reading-inhibit agent can be activated by initial reading of the disc, as for example by exposure to optical radiation associated with reading of the disc, or rotation of the disc.
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