Mac OS X Only Protect your PDFs
Only the Mac OS X has open source application pdfauxinfo is a mortal function that can password protects PDFs. This is the easiest way you just adding passwords and pdfauxinfo can protect the PDF from being copied and printed.
It will give us a Graphical User Interface (GUI) and pdfauxinfo is Automaker command its GUI has provide you easy if you favor to keep away from the fatal.