You can add security on PDF by user and permission password, for protecting PDF files. But when you want set password on PDF files you find that it has prolonged process that take lots of time. But you desire a short and simple process, which easily Secure PDF files. That is why we are offering you Restrict PDF Software that helps you to Secure PDF Files. The Software has two types of security to Secure PDF files; that is User Password and Permission password. User password would restrict PDF files from being opened, while owner password restricts functions like copy, edit, print, etc. The Software supports PDF file of Acrobat version up to 9. You can try software demo version that restrict PDF files up to 25 KB file size or you can buy full version of software at $25.