To unlock PDF files and remove protections from PDF files, you can use the PDF Unlocker Tool which I have also used to remove passwords from my personal document PDF files. This tool works very well and helps to reset passwords or create new passwords in single and multiple PDF files in less time but you must know the old password. After removing the PDF file password you can edit your PDF file and, copy, print, etc. You can easily download this application on any Windows OS.