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Save your form and Test it. Try clicking the "Sign this section" button in both Sections and see how it gets signed but in different ways. In both cases, you must be authenticated to frevvo to 

otherwise an authentication dialog is displayed. Notice also that when the Section is signed, it is locked and can no longer be edited. If you wish to change any value, you must click "Edit this section", change the value and sign it again. The act of signing generates a digital signature based on the data entered into the controls. This digital signature can be used to validate at a later time (e.g. in a workflow or when viewing the submitted form at a later date) that the data in the controls has not been tampered with. If the data changes, the signature will be invalid and a red bar will appear at the bottom indicating data tampering.