An image forming apparatus includes an image reading section for reading an image of a book, to which an information tag is added, so as to acquire image data. Based on information stored in the information tag, the image forming apparatus controls an image forming section. The image forming apparatus further includes a tag addition determining section, an added information determining section, and a control section. The tag addition determining section determines whether or not the information tag is added to the book, and the added information determining section determines whether or not the image data contains added information indicating that the information tag is added to the book. Further, the control section controls the image forming section not to carry out image forming, both when the added information determining section determines that the added information is contained and the tag addition determining section determines that the information tag is not added to the book. With the above structure, it is possible to prevent unlimited copying, which may occur when a storage device added to an original document is removed from the original document.