Digital robbery; authors are not unprotected

The growth of networked systems has magnified the use of raw resources such as images, animations, videos, etc. The networking facilities between different systems and the lack of security between them have introduced the need for image, animation and video copyright protection. One approach used to address this problem is the use of structure that can seal or mark any digital material. These structures are called watermarks. In this paper, we present different solutions, commercial, freeware or scientific, for the marking of multimedia objects.