| 摘要 |
PURPOSE:To accomplish an image forming device capable of optionally using a desired confidential mark and unnecessitating a storing element for registering the confidential mark and provided with a function of preventing the confidential document from being copied. CONSTITUTION:In the case of copying a confidential original 01 provided with the confidential mark A on the prescribed position of the original, the confidential mark A is read, and a scramble processing is applied on it, and the scramble-processed scramble confidential mark SI is added to a prescribed position so as to form an recorded image, and then, a confidential document 0 is obtained. When the confidential mark IA and the scramble confidential mark SI are present on the original in the case of copying the original, the scramble confidential mark SI is reversely scramble-processed so as to obtain a reverse scramble confidential mark, and then, the reverse scramble confidential mark is collated with the confidential mark, and in the case the reverse scramble confidential mark is coincident with the confidential mark, the image copying function of the device is stopped. |
