| 摘要 |
PROBLEM TO BE SOLVED: To provide a data processing device which restricts sensitive influences on contents, while being capable of increasing the durability of watermarking information to accurately extract, and a data controlling system which can ensure the secrecy in the watermarking information to effectively perform the maintenance and control. SOLUTION: A data processing device 10 comprises: an input part 1 for inputting digital data; an image conversion part 2 for converting forms of the digital data; and a watermarking embedding part 3 for inserting watermarking information into the digital data of the converted form. The optimal watermarking information is fed in correspondence to a characteristic of the digital data. In a data controlling system which is constituted by the data processing device 10 and a controller 20 for information which provides a system for inserting the watermarking information, heterogeneous digital data (watermarking information) is embedded in correspondence to characteristics of an image such as character image, photograph image, net point image, or the like, so that the image quality is maintained, while a great amount of digital data can be embedded, and key information is controlled for maintenance, so that the secrecy of the embedded digital data can be ensured. |
