Step-1:- Launch SysInfoTools PDF Protect and Unprotect software the window shown below pops up. To protect a PDF file following steps need to be followed.

Select Protect PDF file option to protect a PDF file.
Step: 1. a
Click on Select file button to select the PDF file that you want to protect.
Step: 1. b
Select the PDF file which tou want to protect.
Step: 1. c
Click on Next button.
Step: 1. d
Selected file is listed in the main window along with its location and size, then click on the next button.
Step: 1. e
At this step user can set owner password and user password along with the encryption level.
Step: 1. f
At this step user can set access permission of PDF file.
Step: 1. g
Click on Open button to select the destination folder wher you want to save the Protected PDF file.
Step: 1. h
Click on Protect PDF file Button to Protect the PDF file.
Step: 1. i
Protection Process is completed. Click on the blue link to see the destination folder where Protected PDF file is saved.
Step: 1. j

Step-2:- To Unprotect a PDF file following steps need to be followed.

Select Unprotect PDF file option to unprotect a PDF file.
Step: 2. a
Click on Select file button to select the PDF file from which you want to remove security restrictions.
Step: 2. b
Click on next button.
Step: 2. c
Selected file is listed in the main window along with its location and size.
Step: 2. d
Click on Open button to select the destination path where you want to save the output file.
Step: 2. e
Click on Remove Restrictions button to remove restrictions from the selected PDF file.
Step: 2. f
Click on the blue link to see the output PDF file.
Step: 2. g