How to password protect a PDF before sending it by email

The quickest way to do this is to ZIP the PDF file and protect the ZIP file, or use Microsoft Office’s built-in encryption tools to create a password. If you use Outlook, you can use Adobe Acrobat IX to password protect PDFs. You can also try programs like NitroPDF and PDF Encrypt to set the password protection to your PDF file without Acrobat. Check this out from PCWorld.com