Pdf Password Security Software - Version 1.0.1.2 Pdf is most popular document file format to send & receive important papers electronically & confidentially of file is main concern. Download free pdf security software to encrypt pdf documents with password & owner restriction to disallow pdf editing, printing & copying features. Program supports locking of document with RC4 & AES 128-bit encryption level protection. Using encryption over the document ensures that only authorized users can view received document with correct input password. Pdf encryption software is provided with the option to restrict only specific features like print, edit, copy, form fill, comment, page extraction, sign, screen reading, format conversion etc. Owner password is required to lock these selected options in any pdf. Only that person/individual can use print, edit or copy option who knows the correct owner password, sometimes called as permission/master password. Free pdf encryption tool display the watermark on the output pdf pages and need to be registered for limitation-free use of program.