Good morning, I need to prevent people from exchanging Pdf files. I want to sell to my students a textbook in pdf, but I want to prevent them from exchanign the files. I have secured the files, but people still are able to copy the entire file and paste it in an other directory, or hard disk or USB.
How can I do?
Thanks for your help,
Bernd is correct: You'll need a drm solution since you can't apply some setting to a specific PDF to prevent that (which is what I think you were asking).