Browse Prior Art Database

Document Security System for Copy Machines

IP.com Disclosure Number: IPCOM000051297D
Original Publication Date: 1981-Jan-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Ludeman, CP: AUTHOR

Abstract

In order to aid in the tracing of confidential documents which have copied without authorization, it is desirable to place some indication or identifying number on the document which identifies an individual authorized to posses the document. If the document is then copied, this identifying number will appear on the copy and the person authorized to possess the original copy can then be determined. This invention consists of a manner of using a conventional copying machine to insert the identifying number directly on each copy produced so that subsequent copies of that document can be traced to an individual authorized to possess the document.

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Document Security System for Copy Machines

In order to aid in the tracing of confidential documents which have copied without authorization, it is desirable to place some indication or identifying number on the document which identifies an individual authorized to posses the document. If the document is then copied, this identifying number will appear on the copy and the person authorized to possess the original copy can then be determined. This invention consists of a manner of using a conventional copying machine to insert the identifying number directly on each copy produced so that subsequent copies of that document can be traced to an individual authorized to possess the document.

Referring to Fig. 1, the transparent image plate of a conventional copier is replaced by the image plate 10. Image plate 10 is a composite of thin transparent glass plates 12 and 14, spacers 16, transparent conductive vertical lines 18, transparent conductive horizontal lines 20, and liquid crystal material 22. This arrangement of materials is typical of a liquid crystal display, except that it is built considerably larger and with a pattern of conductive lines 18 and 20 capable of producing a matrix of small dots. In addition, a light sensitive device 24 is fabricated into one edge of the image plate 10 to provide a signal each time a copy is made.

Referring to Fig. 2, image plate 10 is integrated into a photo copier system with a controller 26 and an operator panel 28. Controller 26 generates the necessary horizontal and vertical scan patterns to form a low contrast dot image of the appropriate identifying number on...