Users sign a form by clicking a signature button on the form. You usually design a signature button with some text or label that indicates its function (for example, “Click to Sign”). Typically, signature buttons are also larger than other buttons because they have to display the signer's name after the form is signed.
When a user clicks a signature button, the Digital Signature Viewer opens. The Digital Signature Viewer lets users sign forms, verify or delete existing signatures, and view the details of what parts of the form were signed. Users click “Sign” to sign the form. If they have more than one digital certificate installed on their computer, a dialog box appears, displaying all of the available signatures from which they can choose only one.
After the user selects a certificate, the form is signed and the Digital Signature Viewer displays the details of the signature. The user can then return to the form. In the form, the signature button changes to reflect the new signature. Typically, it displays the name and e-mail address of the signer (although this depends on the type of signature engine used). Once a form is signed, the Viewer prevents users from changing any of the signed information. Furthermore, when the user mouses over a signed item on a form, a tooltip indicates that the item is signed and cannot be altered.
A form may require any number of signatures. For example, a purchase order form may have two sections, one for the customer and one for an internal staff member who processes the order. The customer might fill out the first half of the form, and then add a signature that covers that portion of the form. The internal staff member might then review the form, and add a second signature that covers the entire form.
Parent topic: About signatures