Can I bring digital Signatures and with a page when I extract it?

Question

I have a client who is adding their own digital signature to documents after reading them. Our current methodology involves extracting the page with the signature and adding said page to another adobe document for our records. However, the digital signature never follows. I am thinking this is by design, but I cannot find unequivocal confirmation. Does anyone have documentation or knowledge on this topic that will clearly state whether digital signatures cannot be copied when extracting pages, or if it can. Of course, if they can, I would also like to know how. Thank you very much.
Eric

Answer 1

You are correct that this is by design. A digital signature provides an assurance about the entire contents of the document, not just the page that it is on (e.g., the signature field is on the last page of the contract, but the signature covers the entire contract).
Extracting just the page with signature would never leave you with a valid signature because all the other bytes of the file would be missing so the signature would not validate.
If you want a validatable record of the signature, you will need to save the entire document. If all you really need is an informal, non-verifiable record, you could try printing the page with the signature to another PDF file which should show what the page looks like. But that is all you'd have so make sure that meets the legal requirements of your situations.