The library provides methods for checking if a PDF document is password-protected.
You can use these methods to check whether you need to provide a password before opening the file.
You can remove encryption from your PDF documents. And, of course, you can protect produced PDF files using RC4 40-bit, RC4 128-bit, AES 128-bit, and AES 256-bit encryption algorithms.
You can setup what permissions you want to grant to users of your PDF files.
All permissions defined by the latest PDF standard are supported.
Take a look at a short sample that shows how to set up user access permissions for a PDF document.