Services that allow the watermarking PDF files with the buyer's data?
for my upcoming ebook project I need you help:
Watermarking as a form of "social DRM" is one that will not block the user in any way - except from giving the paid content away for free (to colleagues, friends, the web etc.), because everybody can see who copied the book.
I know there are several (even smaller) book publishers that offer this method of PDF watermarking. I hardly believe they all have set up their own servers with billing, distribution, watermarking etc. stuff.
Do you know what services offer the watermarking of PDF files with the buyer's data?