| 摘要 |
PROBLEM TO BE SOLVED: To perform sure management against illegal copy and leakage of confidential documents, and also accurately read a finger print for identifying an operator. SOLUTION: When a start button 2 of an operation display part 1 is pressed, a finger print reading part 21 reads the finger print of a finger which contacted a protection bell 233. An authentication information synthesis part creates authentication information by synthesizing the read finger print information and peculiar information of the copying device. A dispersion/synthesis processing part writes the authentication information in plural points of an image data as watermark information, and an image output part 4 prints the image data containing the authentication information on a sheet of printing paper. When all the set manuscripts have been copied, the protection belt 233 is shifted by a certain range by rotating a driving roller 231 of a cleaning means 23, and a cleaning roller 243 cleans the part contacted by the finger of the operator at the time of starting copying, and thus the copying operation is ended. |
