Abstract: An image forming apparatus includes an authentication processor, a registration unit, and a print unit. The authentication processor performs a process for user authentication with respect to a user in response to an authentication request from the user. The registration unit registers the image forming apparatus with a print service system on a network as a printer to be used by the user by transmitting, to the print service system, a registration request including user information of the user and information about the image forming apparatus in the case where the user authentication has been successfully performed. The print unit receives, from the print service system, a print instruction to print an electronic document and executes printing in response to the print instruction.

Abstract: A document processing apparatus for processing an image read from an original document, which includes an electronic tag recording section that records information to an electronic tag, and when processing using the original document having the electronic tag is performed, records a processing history related to the processing into the electronic tag.

Abstract: An image processor employing a plurality of types of scanners including a stored table in which identification numbers allotted to the scanners and scanner control information are registered in pairs, a controller for registering the identification number of a scanner from the operator of the image processor, a controller for requesting the scanner to transmit an identification number representative of its type and receiving such identification number, a controller for setting the registered identification number as the identification number of the scanner when the scanner fails to transmit its identification number within a predetermined amount of time, a reading controller for reading from the stored table scanner control information corresponding to the identification number of the scanner, and a controller to control the scanner in a manner to conform with the scanner control information.