We are using digital signatures to sign off PDF files.
If we update the source document (in Word), but we need to maintain the previous signoffs (their digital signatures), how can we do this?
For example, in Document A, 2 people digitally signed the file.
2 months later, modifications are made to Document A, and it's saved as Document A-1. A-1 has a line for new signoffs.
How do we maintain the signatures from the original signoff? Is it possible?
You need to maintain the SET of files. You can't do this with one, because (for reasons that might or might not be obvious) you cannot lift out a signature and drop it onto a different file. The new PDF will be a different file, not an edit.