| 摘要 |
In a case where the digital watermarking onto the document is implemented once at the time of printing and printed so as to update the printing contents of the document, the contents of the newly printed digital watermark does not match with that of existing digital watermark already printed. The contents of the digital watermark are also updated so to make them in conformity with the printing contents updated. The contents of the digital watermark and the position thereof are read by the scanning operation. In a case where the original digital watermark can be overwritten at the time of on-print processing, the overwriting operation is performed, while, in a case where cannot be overwritten, the printing operation is perform onto the new paper sheet. |
