Browse Prior Art Database

Document Copy Prevention

IP.com Disclosure Number: IPCOM000083500D
Original Publication Date: 1975-Jun-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Bruce, GD: AUTHOR

Abstract

The use of specular paper to record not-to-be-copied information prevents subsequent copying by an office copier, and yet the specular paper original is human readable.

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Document Copy Prevention

The use of specular paper to record not-to-be-copied information prevents subsequent copying by an office copier, and yet the specular paper original is human readable.

Fig. 1 shows a plain paper original 10 as it is scanned during a copy process. The light from source 11 produces diffused reflection off the original's white background. A portion 12 of this reflected light passes on to a photoconductor, not shown, to produce a latent image of the information carried by the original.

Fig. 2 shows a specular, i.e., mirror-like, paper 13 as it is scanned during a copy process. The light from source 11 is specularly reflected, as at 14. Little or no light 15 is reflected to the photoconductor from the original's specular background. Thus, the resulting copy appears solid black, and is not humanly readable.

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