A digital signature in PDF document is used to authenticate the identity of a user and to validite the document contents.

VintaSoft Imaging .NET SDK allows to:

• Add digital signature to a PDF document
  • Add invisible digital signature to a PDF document
  • Add digital signature with image appearance to a PDF document
  • Add digital signature with text appearance to a PDF document
  • Add digital signature with custom appearance to a PDF document
  • Add 2 digital signatures to PDF document
• Add an empty signature field to PDF document for further document signing by user
• Verify digital signatures in PDF document
• Remove digital signature from PDF document
• Add long term validation (LTV) information to all digital signatures of PDF document
• Restore a PDF document to the state at the moment of document signing (PdfSignatureInformation.SignedRevision).