Encrypting PDF files with owner and user password is an ideal way to protect your authority and copyright. A user password can help you to control the permission of opening a PDF, while the Owner password can protect your PDF files from reuse. Obviously,...

One of the thorniest issues that can happen to your iPhone/iPad/iPod is that one fine day it turns up blank, gets stolen, broken, water damaged, crashed or won't boot up, and you don't have a recent backup, it makes you realize that you've lost all the...