If you have a PDF file on your computer that is protected so that you cannot open or edit it, you will need to remove the protection from that PDF file. If you did not originally create the PDF file, you will have to use some third-party software to remove the restrictions on the file. GuaPDF is a program that can be used in Windows, Linux and Macs to remove protection from PDF files. It is easy to use and quickly removes protection. Writer Bio
