Install the DocuSign Signature Appliance behind your firewall and configure the system to work with your internal tools. To sign an agreement, your customer selects the “Signature Appliance” signing option in her authoring tool (e.g., Microsoft Office or AutoCAD), which is verified against your company’s ID management system. The DocuSign Signature Appliance generates their signature, using a digital signature that follows industry Public Key Infrastructure (PKI) standards. Any changes made to the document after signing are immediately detectable by any of thousands of PKI-enabled document readers.