An image forming system which is capable of enhancing security in an i-copy function. A server apparatus stores document data once having been printed in association with a sheet identifier recorded on a print sheet on which the document data has been printed. An image reader section reads the sheet...http://www.google.de/patents/US7653947?utm_source=gb-gplus-sharePatent US7653947 - Image forming system, image forming apparatus, control method therefor and program implementing the control method
