The Adobe PDF format allows document authors to restrict the viewer's access to certain functions within the document they are reading..

The level of protection authors can apply depends on the Acrobat PDF format being used. PDF-XChange supports these security features in full and makes them very easy to use.

The Security property allows you to enable or disable PDF document security, you can enter user's and owner password for PDF document, set encryption level and specify users' permission levels for the document in question.