title: iText PDF Approval and Certification Signature
body: <p>I am using iText for PDF signing. </p>
  
  <p>My PDF form has 3 signature fields. The first two fields are for approval signatures and the last field is for certification signature. Certification signature is always signed after the approval signatures and Append mode is set to true for all signatures. </p>
  
  <p>My question is after the certification signature is signed (certification level set to CERTIFIED_NO_CHANGES_ALLOWED) the validated approval signatures will become invalidated while the certification signature is validated. </p>
  
  <p>How should I go about fixing this? </p>