| 摘要 |
<p>PROBLEM TO BE SOLVED: To discriminate whether a person has proprietry rights or not by burying information specifying a distribution destination opposite party and more preferably, the person having the propriety rights in data in an electronic watermark form which is inseparable from the data in distributing the data such as picture data and sound data to a person except for the person having the proprietry rights. SOLUTION: When a client 12 requests access to a stored picture of a picture server 10, the input of information specifying the client 12 is requested from the picture server 10. Client side information and information such as on access date/time and use target classification of which the client 12 inputs and possessor information from the picture server 10 which corresponds to the picture, are buried in picture data 20 by a watermark encoder 13. Buried information is also divided to respective information such as an alteration preventing code with weak resistance, a client with strong resistance, the access date/time, an author and portrait rights. Thus, the proprietorial rights can be insisted and the presence or absence of the alteration of the data can be discriminated.</p> |
