Ключевые слова: secret pdf, password protect pdf without acrobat, drm software, free pdf drm software, secure pdf viewer, secure pdf, document security, drm software, secure pdf from copying, lock pdf, pdf security, lock pdf from editing, encrypt pdf, secure pdf

Secret PDF enforces DRM controls with AES, random encryption algorithms and public key technology. We design this application to help those PDF owners who would like to restrict their documents from being redistributed and opened by unauthorized users.

It is known to all that it is quite unsafe to protect your PDF documents with only open password and owner password, since they could be both cracked and shared easily. What more, so many free pdf password remover software there could remove your protection and restrictions.

We use key technology to deal with the issue. User generates a local key in his/her computer device and sent it to the owner. The owner produces a new key based on the local key. The user could only open the PDF document with the owners public key in the authorized device (the computer the user generates the local key). In other computers, the open request will be denied.

Our built-in PDF viewer could also restrict the readers from accessing permissions. In current version, our viewer only allows users to read rather than copying, editing, saving, converting and printing.


Requirements
Windows Vista, Windows 7, Windows 8, .Net 4.0 or later.
Intel Core2 Duo 2.4GHz processor or higher recommended.
256 MB RAM or higher recommended.
50 MB of free disk space.
All Desktops, Laptops, Tablets, Convertibles based on Windows OS.

Main Features
Generate local keys.
Generate owner's keys.
Pair local keys and owner's keys.
Lock PDF to specific computers.
Stop PDF printing, copying, editing, saving and converting.
Stop PDF being distributed and opened by unauthorized users.