| 摘要 |
A control unit of an image forming apparatus executes a program including the steps of: calculating a hash value based on image data received from an image processing terminal; if the same image has already been printed by a user of the same group, giving a notice to that effect to the user who requested printing; if request to continue printing is nevertheless issued, printing the image data; updating hash log information of itself if the same image has not been printed; and establishing synchronization of hash log information with other image forming apparatus or apparatuses.
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