Image forming apparatus which can prevent copying during a prede

Details Image forming apparatus which can prevent copying during a prede Image forming apparatus which can prevent copying during a prede

1994-06-28

1995-11-14

Royer, William J.

Photocopying

Contact printing

Light boxes

283 72, 283901, 283902, 356 71, G03G 2100

Patent

active

054671698

ABSTRACT:
A copy allowable time can be set for a document, and can be embedded in a hard copy of the document as discrete signals which cannot be recognized with the naked eye. A digital copying machine allows the document to be copied in a copy operation during the copy allowable time and, at other times, either prohibits copying or changes the copy operation.

REFERENCES:
patent: 4739377 (1988-04-01), Allen
patent: 4882604 (1989-11-01), Kato et al.
patent: 5216724 (1993-06-01), Suzuki et al.
patent: 5257119 (1993-10-01), Funada et al.
patent: 5321470 (1994-06-01), Hasuo et al.

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