How can I add a watermark to my PDFs that are uploaded via the media library of the logged in WordPress User when viewing and printing the pdf.
I have tried utilizing plugins but they are all limited in one way or another.
The closest I was able to get was with the Premium WordPress plugin Secure PDF Embedder by WP-PDF and editing the containers styling to display the entire pdf as opposed to a single page. However I was only able to load all pages (visibly in the front end) when you selected to view in full screen and even then you have to use the browser print instead of the typical pdf print button.
Any snippets to get me started would be appreciated.