Adding a later signature to a signed document
I need to sign a document and have my client sign the document. A copy of that digitally signed document then needs to be sent to a third party. After the copy of the digitally signed document is sent to the third party, I need to add an addititional signature to a page of the document (attesting to the fact that I sent the documnt to the third party) and then have the final document with all three signatures, my original signature, the client's signature, and my second signature.
Is this possible? If not, this is a fatal flaw in design because there are many instances where a digital signature needs to be added to the original signed document later, but the document also needs to be available before that final signature is added.
