Digitally+Signing+a+document

Word takes care of this in two ways. It provides an easy way to set up an electronic document for a signature, by either typing the signature or using a scanned image as a picture. Word also attaches a digital certificate that has been issued to the signer from a reliable source. To prevent any alterations to the document after it has been signed, the digital signature is invalidated if any changes are made.
 * Signing a Document with a Visible Signature**