How to remove encryption from a PDF file
There are times when a PDF truly needs encryption—for instance, if it contains sensitive information and someone just emailed it to you (let’s hope they used another communications method to send you the password). Once on your internal drive, this file should still be encrypted. But if you keep your sensitive files in an encrypted container, or if you’ve encrypted your entire drive, the file’s own built-in encryption is just an inconvenience. Get some tips on this article from this link PCWorld.com