Question : PDFs and iPads

I've been reading a lot about hack programs that allow people to strip all security measures on PDFs, even if a password has been set. I am setting up a PDF that will be added to a few iPads. It's supposed to be confidential. Is there any way I can set it up so that if it does end up on the Internet, I can look at the file and tell who leaked it? Perhaps some kind of watermark or digital signature?

Answer : PDFs and iPads

That is a verry, verry hard thing to do.. there are a lot of tools available for both watermarking and signing pdfs, but in the end a user could just copy the content of the file, paste it in a open office document, create a new pdf and then publish it. even if you make sure you cant copy the text inside theres always printscreen+ocr..