Password Protect Pdf - Version 1.3 Pdf document is a vital resource of content sharing online and its security is major concern. Password protect pdf documents with user and owner security & restrictions with pdf encryption software. Tool supports RC4 & AES encryption security. 40-bit and 128 -bit long encryption strength can be applied on each selected documents. Adding security ensures you that only intended persons can open and view pdf document. Using pdf encryption security, you can also add desired restrictions on selected pdf documents. These restrictions are optional and may be pdf editing, pdf printing, pdf copying, pdf signing, pdf commenting, pdf page extraction & pdf form filling etc. Pdf locker software is easy to use and Windows XP, Vista & 7 compatible. Free version is provided on our website for evaluation purpose to test and evaluate product performance.