Hiding encrypted messages in information carriers
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United States of America Patent
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Oct 25, 2005
Issued Date -
N/A
app pub date -
Jul 25, 2001
filing date -
Nov 18, 1993
priority date (Note) -
Expired
status (Latency 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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