Method and apparatus for the prevention of unauthorized copying

Details Method and apparatus for the prevention of unauthorized copying Method and apparatus for the prevention of unauthorized copying

1986-05-30

1987-07-07

Wintercorn, Richard A.

Photocopying

Miscellaneous

355 14R, G03G 1500

Patent

active

046783229

ABSTRACT:
Method and apparatus are disclosed for the prevention of unauthorized copying of documentation on an office, or other type, copier. Unique phosphors are applied to paper. When such a paper is placed on or in a copier so prepared, the presence of the phosphor is detected and the copier is disabled. Inside the copier a laser emits a beam toward the paper. Two detectors detect, respectively, the laser light reflected from the document and the stimulated light from the phosphor coating or layer. Detection of both signals, in the proper time sequence, will cause the photocopier to cease operation prior to electrostatic or other capture of the image. Upconversion phosphors could be utilized as the phosphor coating due to their scarcity and unliklihood of use in this manner.

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IBM Tech. Disc. Bull., "Preventing Copying of Classified Information", vol. 19, No. 4, Sep. 1976, pp. 1469-1470.
IBM Tech. Disc. Bull., "Unauthorized Copy Prevention", vol. 18, No. 1, Jun. 1975, pp. 59-60.

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