From: http://a-pdf.com/faq/how-to-add-watermark-to-pdf-file-so-as-to-reduce-piracy-of-the-documentation-with-a-pdf-watermark.htm. A-PDF Watermark allows you to add text/image/PDF/shape/dynamic datetime watermark to all or each PDF pages. More see: http://a-pdf.com/watermark/index.htm
