Flatten PDF after Signature

Forum|Forum|4 years ago
May 12, 2021
2 replies
3431 views

My PDF has textfields, checkfields and signature fields. Ideally the Signer fills out the form and then signs all the signatures.

But it is technically possible to change a field after a signature has been entered.

How can I design the PDF in such a way, that makes it impossible for the Signer to change a field after a signature? I mean a kind of sealing of the PDF.

This topic has been closed for replies.

try67

Community Expert

Go to the Properties of the signature field and under the Signed tab select the option to set all fields as Read-Only:

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Ranjeet5C86Author

Participant

That is an interesting concept. May I ask how to archive that in PDFBox? The PDF is generated in C++, than goes through a webservice and there I wanted to modify the pdf. I would love to execute a script once it is signed.

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Ranjeet5C86Author

Participant

Unfortunatly I did not find that Property. Where exactly do I find it?

BarlaeDC

Community Expert

Hi,

It might be technically be changeable, but the signature would be marked as invalid, meaning that you can see that the doc has been changed since it was signed.

When you sign you can select to lock document after signing

does this not solve the problem?

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Ranjeet5C86Author

Participant

It does not, because the Document is signed by a costumer and that person may not know how to do it or may not want to do it.

Is there no automatic solution?

I remember a popup saying "Invalid signature". May I ask in which PDFDictionary entry stores such an information?

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