title: Signing a PDF with a PFX File
body: <p>Is there complete and simple code available to show me how to sign a PDF with a pfx file?  the following example only work with older versions of iText.  When I used an older version, this code corrupted my PDF file and it couldn't be opened by Adobe Reader.  And I'd like to use the most recent version of iText so my code will last into the extended future.  </p>
  
  <p>All I need to do is:
  1) specify an existing PDF
  2) specify the pfx file
  3) specify the pfx password
  4) specify and output file.  </p>
  
  <p>Thanks!</p>