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The expansion of the Internet in the past years has rapidly enlarged the accessibility of digital data like digital audio, images and videos to the common community of people. The rapid development in information technologies has given an extended and easy access to digital data. Digital data is a major trend of business communication today. Therefore, copyright protection of digital data has been a significant research issue of information security. Digital watermarking is one of the proposed solutions for copyright protection of multimedia and it is becoming a major player not only for use in images but also in the latest technology such as audio, image and video. It also has applications in defense, certification of business documents, distribution, anti-forgery of the digital media. It is an important area of study in information hiding and retrieval. The secrecy of the image may be adjusted using the level indicator (LI) introduced in this paper. Comparison of different watermarking techniques for various LI values is accomplished in this paper to test robustness.

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