Best ebook protection software can lock PDF file for open password and owner protection with restrictions of printing, form filling, changing, singing, text graphics copying and commenting. Restrict PDF is one of the most suitable utility to lock PDF files so that none of the unauthorized users can harm content or information of PDF files. The program allows users to lock PDF from copying, editing, printing, viewing and enable every user to secure data stored on PDF files. With Lock PDF program users can quickly apply PDF restrictions & set PDF permissions. User can lock PDF files by applying User password and Owner password on PDF. This tool can work as restrict PDF Files, restrict PDF Protection, U restrict PDF Printing, restrict PDF Password, restrict PDF Permissions, restrict PDF Security, restrict PDF Copy Paste, restrict PDF Commenting, etc. Tool secures PDF with 40 bits and 128 bits RC4 & AES encryption level. It is support to add prefix and suffix with resultant file name. It is providing high and low resolution of PDF file. Software is standalone, does not require Adobe Acrobat PDF file. Software successfully runs on different Windows operating system such as Win2000, Win7 x32, Win7 x64, Win98, Win Vista, Win Vista x64 and Win XP.

Features:
* Use Lock PDF program to protect PDF, secure PDF, restrict PDF etc.
* The program enables users to add restrictions to PDF file so as to lock PDF files for copying, editing and printing.
* Software will add both user & owner password to PDF document.
* Restrict all unauthorized users to open or view PDF files.
* You can create a password protected private secured file.
* It is providing high and low resolution of PDF file.
* It supports 40-bit Encryption and Adobe Advanced 128-bit Encryption.
* You may add prefix and suffix with resultant file name.
* Does not need Adobe Acrobat software.
* The program to lock PDF files successfully runs on Windows 98, ME, NT, 2000, XP, 2003, Vista, 7 systems.