Methods for audio watermarking and decoding

Cryptography – Electric signal masking

Reexamination Certificate

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C713S176000

Reexamination Certificate

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06983051

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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