A digital copier or a complex copier having a facsimile function is provided with a security function for keeping a record of persons who copied or transmitted images, the dates of copying or transmission and the kinds of the images in a manner which is not known to a third person. When a scanner included...http://www.google.de/patents/US5642199?utm_source=gb-gplus-sharePatent US5642199 - Copier having a security function
