Copy restrictive system

Details Copy restrictive system Copy restrictive system

1996-02-08

1998-05-12

Braun, Fred L.

Electrophotography

Document handling

Original

283902, G03G 2100

Patent

active

057521522

ABSTRACT:
A system and associated method for restricting the copying of an image document that contains an image of arbitrary and undetermined character that is formed in or on a document medium having a predetermined pattern of microdots. One embodiment of the system includes a copy machine and associated software that scans for the presence of microdots in an image document and if present prevents the copy machine from making a copy. The microdots are of such a size that they are not visible to the unaided eye, but when machine scanned their presence is sensed.

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Nature, p. 119, vol. 156, 1945.
Research Disclosure No. 365, Sep. 1994.

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