Pdf encryption software is one of the best solutions for securing pdf documents from unauthorized users. Pdf security software locks pdf files with open password as well as owner guard protection. Program provides facility to lock pdf files with desired user & owner password. Tool locks document with 40 bit RC4 and 128 bit RC4 & AES encryption level security. Download and tryout our free evaluation version of pdf encryption security which supports protection of bulk pdf files. Locking pdf files with open password ensures the owner of pdf that it can only be opened by authorized person because it pop-up to type open password to view, copy & print pdf content. Pdf owner password, sometimes also known as pdf master password is used to encrypt pdf content stream with strong protection key and disallow all pdf rights like pdf editing, printing, copying, form filling, signing, commenting, page extraction etc. Pdf encryption program can lock single pdf as well as bulk pdf documents in a single hit. User can select the options which one need to enable and which one need to disable. Features: (1) Tool locks document with 40 bit RC4 and 128 bit RC4 & AES encryption level security. (2) Tool is compatible with all latest Windows OS including XP/VISTA/7. (3) Pdf security software locks pdf files with open password as well as owner guard protection. (4) Tool is GUI based and contains inbuilt user help manual. (5) Program is easy to use and non-destructive utility.