. Certificate a given PDF with given certificate:
Input a PDF, a Certificate and the respective password. Use "useDefaultPosition" and the input coordinates to control the location of the certificate on the PDF. If "useDefaultPosition" is true, the coordinates will be ignored.

. Validate a given certificate versus given password:
Use if you only want to Validate a Certificate.

. Use an Image of a Signature and append it on the PDF:
Use XPos, YPos, ImgWidth and ImgHeight to set the given image position and size.
Use the PageNumber to set the page where to insert the Signature.