Adding custom properties to PDF digital signatures

Q: Is it possible to set custom properties to digital signatures using Qoppa’s PDF SDK?

A: Yes, it is possible to do so using jPDFSecure, jPDFProcess or qPDF Toolkit.

Adding custom property to the signature dictionary

This method can be used to add additional custom properties to the signature dictionary.

SigningInformation.setCustomProperty(key, value);

You can retrieve the values custom properties from the signature dictionary of a signed PDF using the following method (added in v2017R1.02).

SignatureField.getSignCustomProperty(key);

Adding / retrieving custom property to the signature Field

This method can be used to add additional custom properties to the signature field dictionary.

SignatureField.setCustomProperty(key, value)

You can retrieve the values of the custom properties in the signature field dictionary by using the following method:

SignatureField.getCustomProperty(key);