First of all, if you’re very concerned about security you should be using WooCommerce to distribute your PDFs because it collects more information from customers during checkout, even with free files. Plugins such as Easy Digital Downloads will only collect a name and an email, even if a product is sold, and so that is all that can be stamped. WooCommerce allows you to collect name, email address, phone number, business name, and more.
WaterWoo has a further edge on ALL other watermarking plugins in that it offers two watermarking positions on the page. That means on each page you can have a header AND a footer, or a header and an overlay, or an overlay and a footer, or one or the other — it’s up to you! What further sets WaterWoo apart is that positioning on the page is fine tune-able – you can put the watermark absolutely anywhere you want on the page. Other plugins limit watermark placement to specific quadrants of the page, but WaterWoo will watermark anywhere on the page – and with two separate watermarks if desired.