An image producing device such as a copier or a printer includes sensors for determining the presence of output from a previous job in the paper path or a finishing device. A particular operator's access rights are determined through a login process. Depending on the operator's access level, i.e., authority...http://www.google.com.hk/patents/US5270773?utm_source=gb-gplus-share專利 US5270773 - Image producing device with security to prevent disclosure of sensitive documents
