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United States of America Patent
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Jan 29, 2002
Issued Date -
N/A
app pub date -
Jun 29, 1999
filing date -
Nov 18, 1993
priority date (Note) -
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Abstract
An identification code signal is hidden in a carrier signal (such as an electronic data signal or a physical medium) in a manner that permits the identification signal later to be discerned. The carrier signal can thereby be identified, or some machine responsive action can thereby be taken. The technique can be applied in video imagery embodiments to control associated video equipment, e.g. to serve as a copy control signal.
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