Patent ID: 8279469

Claim:
An image forming apparatus, comprising: a printing data reception section that receives printing data through a communication section; a printing data storage section that stores the printing data received by the printing data reception section and authentication information added to the printing data in association with each other; a printing section that prints the printing data on a printing medium; an information reception section that receives first information; a matching section that matches the first information received by the information reception section with the authentication information added to the printing data; a retrieval section that retrieves from the printing data storage section the printing data processable on the basis of the first information matched by the matching section; a presentation section that provides a list of the printing data retrieved by the retrieval section; and a permission section that, in a case where, while the list of printing data is being provided by the presentation section, the print data reception section receives an instruction to print the printing data on the printing medium and second information, and the instructed printing data is included in the printing data processable on the basis of the second information matched by the matching section, permits printing of the instructed printing data on the printing medium, wherein the printing start function is disabled until it is determined that the instructed printing data is included in the printing data processable on the basis of the second information, and following the permission section permitting printing of the instructed printing data on the printing medium, the printing start function is disabled, the presentation section again provides the list of the printing data processable on the basis of the first information matched by the matching section and the print data reception section receives a new printing instruction to print the printing data, and when the information reception section receives the new printing instruction and the second information, the permission section permits printing of newly instructed printing data on the printing medium.