None of us like when someone else claims our work as his own, without crediting the original author. The best and the easiest way to protect your content is by watermarking it with your name, company name or site logo.
PDF Watermark Creator is a free tool that lets you watermark your PDF pages in bulk quickly and easily. To stamp a watermark on your PDF files is to mark you PDF documents as your copyrighted property. The watermark can be stamped behind virtually every elements of a PDF file. You can choose whether to overwrite the existing text of a PDF file when the watermark is created.