If you want to modify the author, tags, and title metadata after Word to PDF conversion, use an online tool like Sedja, PDF Candy, or 2PDF.
Try PDF2Go, iLovePDF, or Smallpdf if you want to add a password to your PDF. If you have a paid subscription to Adobe Acrobat, you already have the option to add a password to PDFs. You can also remove a password from a PDF using various tools.