In the old version (AsposePdfKit) I use to be able to set a Digital Signature field in PDF to an image.
Example:
Where pdfLetter is a Form object:
pdfLetter.FillImageField(fieldName, signatureImageFilename);
However the above is now throwing an error: Field name 'Signature' doesn't represent valid text or button field. Field name 'Signature' doesn't represent valid text or button field.
FileVersion 7.3.0.0
Production Version: 2012.08.28