| 摘要 |
<p>PROBLEM TO BE SOLVED: To settle a conventional problem where the access log does not remain on record and its path cannot be traced even when the access log is spread outside due to the wrong copies, etc. SOLUTION: This system includes a server 10 which handles the input information as image data and defines the copyright information inherent to the image data as watermark data A with the access log information on the access of the image data defined as watermark data B respectively and then superimposes both data A and B on each other on every page of the image data and a recorder 11 which stores the image data including the data A and B superimposed on each other. As a result, a data outflow path can be traced at the time of injustice such as data flowing out.</p> |
