| 摘要 |
PROBLEM TO BE SOLVED: To provide an image forming apparatus which prints original data, without printing visible an information matter on a paper and without being aware of a user. SOLUTION: A driver 20 adds an electronic watermark on print image data and forms printed data from the print image data including the electronic watermark, a memory 10 stores the print data including the electronic watermark, and a printing processor 13 prints the data including the watermark. A manuscript reader 14 starts reading the manuscript. If a watermark reader 11 detects electronic watermark information, it sends the detected data to a controller 12 to read corresponding printed data from the memory 10, based on the detected data, and the processor 13 prints the read data. |
