Patent classifications
H
ELECTRICITY
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H04
ELECTRIC COMMUNICATION TECHNIQUE
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H04N
PICTORIAL COMMUNICATION, e.g. TELEVISION
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1/00
Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
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H04N1/00838
Preventing unauthorised reproduction
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H04N1/00864
Modifying the reproduction, e.g. outputting a modified copy of a scanned original
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H04N1/00867
with additional data, e.g. by adding a warning message
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H04N1/0087
with hidden additional data, e.g. data invisible to the human eye
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