Digital signature
This option allows you to digitally sign the output PDF file.

User-specific - if you choose this, each user will be able to upload personal digital signature to be used for PDF signing. They can do so via user certificate widget on the Dashboard:

Certificate file - you can select the generic digital signature file
Certificate password - password to the certificate provided
Reason - reason of signing the document
Location - signing location
Contact - contact of the signing person
Visible - if enabled the provided signature image will be displayed in the PDF on certain position
Image file - image with the signature, can be PNG file with transparent background for example
Alignment - this allows you to select the position of the signature image
Timestamp - this option allows you to select external timestamping authority server
Server - external timestamping server URL
Login - external timestamping server login
Password - external timestamping server password