Chen:

An electronic signature is a digital representation or scanned imaged of a persons signature or 'chop'. It is what we use to identifiy a person in paper transactions, bank transactions, credit cards etc.

You will have to take into account how to control those signatures, so unauthorized use is not possible. That is only the person whis signature it is can apply it to a document. I am use that some sort of audit control / transaction, to show user / signature / timedate stamps should also be considered

HTH
Regards
Haydn