Need of Watermarking.

In these days it is very hard to protect some information or image or video or any other thing from theft. Though we used many techniques to protect out data ,someone steals it and deletes that technique and frees it from our identification.So it is very hard to protect our data.
To overcome this problem we have a solution i.e is called as watermarking.In watermarking we insert some bits of data into our data or image or audio or video.That bits most probably contain author and copyright information of that file. Watermarking is also called data embedding and information hiding.