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Semi-fragile watermarks can sustain attacks from normal image processing, but are not robust against malicious tampering. Fragile watermarks are easily corrupted when the watermarked image is compressed or tampered with. They use the fragile watermark, semi-fragile watermark, and robust watermark, respectively (Fabien, Ross, & Markus, 1999). The watermarking schemes can be grouped into three kinds, largely, dependent on its application. The hidden data can be recovered and used as proof of rightful ownership. In order to safeguard copyrights and rightful ownerships, a representative logo or watermark could be hidden in the image or media that is to be protected. The digital watermarking technique is an application of steganography (Chang, Huang, & Chen, 2000 Chen, Chang, & Huang 2001). The hidden data is not perceptible by the human visual system (HVS). On the other hand, the second scheme is steganography where the important message or secret is hidden in the digital media. This scheme requires much computational process and time to encrypt or decrypt. The first scheme is the traditional cryptography where the important data or secret is to be encrypted by a special process before being transmitted on the Internet. Currently, there are two schemes to protect data on the Internet. However with the invention of digital products, protecting rightful ownership has become difficult. Previously, artists and publishers painstakingly signed or marked their products to prevent illegal use. Therefore, protection against these illegal acts has become a mind-boggling issue.
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Undoubtedly, the rights of ownership are violated and vulnerable to the predators that stalk the Internet. However, the easy downloads and duplications on the Internet have created a rush of illicit reproductions. AbstractIn recent years, services on the Internet have greatly improved and are more reliable than before.