title: How to digitally sign PDF documents using Python with an etoken (pen drive)?
body: <p>How to digitally sign PDF documents using Python? I have an etoken (in pen drive). </p>
  
  <p>Additionally, I have created an excel file using openpyxl and converted it into PDF. Now there is a requirement that I need to add digital signature to that PDF document.</p>
  
  <p>Is there any way I can achieve this in python?</p>