DIGITAL WATERMARK

DIGITAL WATERMARK

ABSTRACT

Legalization of any physical entity like any product, research paper (traditional media) you can use logos, holograms, trademark, letterhead, serial-no.
What about digital media?
So you need some technique, some way to legalize your copy of digital material. That give birth to technique called digital watermark.
In this paper we are going to study Techniques of embedding a secret imperceptible signal, directly into the original data in such a way that always remains present, called Digital watermark Here, we can know what actually watermark is? and It’s applications. The most obvious application is to use watermarks to encode information, which can prove ownership, e.g., copyrights. However, digital watermarks can also be used to encode copy or read permissions and quality control information.
In this paper, we stick to image watermarking, an image authentication technique by embedding each image with a signature so as to discourage unauthorized copying is proposed but we found some misuse of this technique in hidden communication in branch of steganography.