An image forming apparatus for use in a network system including a network and a plurality of print-data-outputting apparatuses which sends via the network print-data including identification information identifying the print-data-outputting apparatus to the image forming apparatus for outputting a hardcopy...http://www.google.com.au/patents/US6515755?utm_source=gb-gplus-sharePatent US6515755 - Image forming apparatus, system, and method having an anti-counterfeiting function
