How to edit a secured pdf in Linux is a question that is asked very often. The answer is to boot Ubuntu Linux. In Ubuntu you have the document viewer called Evince. It’s pre installed so no new installation is necessary. Go to Evince and open the pdf file from in there. Now go to the print option and click on print to file using a new name. The file you have just created with the print option is now an unsecured pdf file which you can edit. To edit the file simply do a right click and choose edit from the options. That’s it.