Hello,
We’re planning to use Aspose PDF to prepare PDF documents for digital signing. PDF specification 1.5 supports using a ‘SigFieldLock’ dictionary on the signature field to prevent form fields from being edited after a document has been digitally signed.
I haven’t found a way to add the dictionary to the field myself, so it would be very useful for us if this feature could be implemented in the Aspose PDF library. Or is there another way to add this behaviour to the signature field using the current library?
See PDF Reference: https://online.flippingbook.com/view/415756/696/
I have a sample PDF document avaialble that uses this functionality. See attachment.
Best regards,
Wouter
Lock form fields after signing example.pdf (72.5 KB)
Example without lock.pdf (75.8 KB)