Chilkat Python Encryption Library 4.0
The Chilkat Python encryption library provides an advanced API for symmetric encryption, public-key encryption, digital signatures, hashing, and encoding/decoding.

AceDRM 1.0
AceDRM is a very magical software, it includes server and client program. AceDRM-server is responsible for encrypting files, AceDRM-client is responsible for browsing encrypted files. The files which have been encrypted by AceDRM-Server can only be browsed its documents via AceDRM-Client , but the contents of the documents can not be removed.

Lizard Protector Web Content Security 2.01
Protect your HTML, web pages, web sites, elearning courses, images, ebooks, documents, PDF and flash files from unauthorized use and misuse. Stop copying and sharing. Determine if you content can be printed and if so, how many times. Control how long your content can be viewed. Strong US Government strength encryption with digital rights management (DRM) controls. No passwords for users to enter, manage, forget or pass on to others.

LockLizard Safeguard PDF Security 2.6.29
PDF document security software with US Government strength encryption and DRM digital rights management controls. Control who can view your PDF documents and how they are used. Stop copying, sharing, modifying, and screen grabbing. Control the number of views and prints or disallow printing altogether. Control when documents expire and instantly revoke them. No useless pdf password security. Complete PDF copy protection and PDF control.