Invalid Signature 

Definition

A signature is invalid if at least one of the following points applies:

·        Changes have been made to the signature that have invalidated it, such as changes to texts or the layout.

Note that, from Adobe Reader 7, the signature continues to be shown as valid if changes are made to input fields. A checkmark and exclamation point appear with information that the document was changed at some later stage. Also read the information about different document versions.

·        The certificate for the signature is invalid. The same conditions apply as described under Invalid Certification.