What DRM software is best for protecting PDFs?

Answer 1

Copysafe PDF provides the most secure copy protection with additional options for DRM protection to prevent unauthorized forwarding and redistribution. Used by telecoms, law courts and the military worldwide, Copysafe PDF is the only recommended solution where copy protection of a document is mission critical - http://www.artistscope.com

Answer 2

If You have a WordPress website you can apply DRM, copy protection and watermarking to images, PDF and video by using either the Guest Video plugin which includes file storage, or the SafeGuard Media plugin with your own file storage.

Answer 3

In MaiPDF, we are offering two ways of PDF sharing. Online and offline.

The way which online DRM means: Upload pdf files (with password or not) to MaiPDF site, and turning that file into a web link or an QR Code, and you can set up your own pdf DRM into that sharing link, you can add “the maximum open times allowed for this pdf file”, “the reading during for each time that file is open”. After that, you can track the result of read.

The way which mean by offine DRM is make your PDF file into a readable HTML file which compatible to all most all the modern browser, reader can open the files in browsers like Chrome Firefox, Edge etc. The offline file is like other expensive DRM supplier do, the file needs to be verified to a validation server through before it can be open.