Abstract
Internet user increased explosively by the spread of the broadband environment.
Therefore, the use of digital contents has extended.
If digital contents are copied, the quality is not deteriorate.
On the other hand, digital contents have the danger of illegally copied.
The problem of illegal contents is a trouble of the digital contents business in the industry,
and the damage of the copyright infringement is growing.
It is necessary to verify the means to solve the problem from these backgrounds,
and to construct the system solution to aim at healthy development of the contents business.
In this research, the system that used the digital watermark for the core element was constructed,
and the effectiveness by the copyright protection solution was verified.
