An image processing machine having an electrophotographically making copies of one or more originals. This image processing machine is designed to inhibit the electrophotographic copying function in the event that one attempts to make a copy of valuable papers such as monetary papers or securities and...http://www.google.se/patents/US5379093?utm_source=gb-gplus-sharePatent US5379093 - Image processing machine capable of inhibiting copying of valuable papers
