Watermarks are a way for publishers and copyright holders to identify copyright infringement and to indicate the precise page from which the image or text was copied. If someone were to copy a document, remove the watermark and then display it to a friend, there would be no obvious evidence of its origin. In the absence of a watermark, the only way to identify a source is through comparisons of the work with other works. Watermarking gives you the ability to ensure that copies you make are yours and not copies that have been copied without your permission.