Pdf (Portable Document Format) is the world's most favourite document format. For file sharing & transferring pdf is used globally. For some special attributes day by day rising it's popularity. Pdf looks like a beautiful book. When a document file created so that's documents are also protected. You can read this documents by help of pdf reader, E-book reader and many other utilities software. Now it is used randomly for online books. Ebook means 'Electronic Book'.
For copyright & other uses watermark is essential. You can add watermark text to any pdf pages with the help of watermark soft. This soft size is only 326 KB. Look at this link for directly download.