| 摘要 |
PROBLEM TO BE SOLVED: To reduce or eliminate the possibility of duplicating originals of secret or guaranteed documents by a copy, an electrically processing method, etc., using a photograph or an electronic device. SOLUTION: In this method a facility is provided which has an electronic printer equipped with at least a kind of access controlling mechanism, and original documents are printed by the access-controlled electronic printer so that an image printed by it is produced at least from marking materials containing at least a kind of a photoactive additive, and a reproducing device of all the access non-controls is installed in the facility provided with an illuminating light source for secrecy with which an intended secret or guaranteed documents are irradiated with an intensity enough to activate the photoactive additive. Moreover, the facility has such a configuration that the intended secret or the guaranteed documents are irradiated with the illuminating light source of the access non-control reproducing device, and a printed image of the original document can not be copied or scanned at ordinary copying or scanning illumination intervals. |
