7
votes
2answers
363 views

How to add random lines over text as a watermark and anti-OCR?

I would like to add a sort of a watermark to a PDF file produced using LaTeX. I have in mind graphical elements (lines, circles, etc.) that would partially obscure the text on the page. The ...
51
votes
6answers
4k views

How to add an invisible watermark to pdf documents?

I'd like to add an invisible watermark to each PDF document that I produce so that in case it leaks, I know where it leaked from. Anyone knows what would a good way for an invisible watermark be in a ...