Hello,
I have looked at the documentation about signing the pdf and concatenating PDFs. But is there a way to concatenate two signed PDFs and keep the signature as it was?
The scenario is, there is one signed PDF, when doing pdf processing, we could merge it with an extra page. If I just concatenate them, the signature would become invalid after merging.
It’s not an issue. It’s by design. A signed file can’t be edited, as that invalidates the signature. You need first to combine the files and then sign them all as a single document.
Thank you for the answer. Then we could not sign the merged PDF by program. Original signers should be requested.
It depends on what you want to achieve, but if you manipulate, merge, or edit the Pdf document, the user should sign it after all that has been done.