Invalid Certification of a Form
Use
A certification is invalid if at least one of the following points applies:
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The form has been changed without permission.
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The changes made do not comply with the change options allowed for the form.
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Changes have been made to fields that are blocked against user input.
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Changes have been made to elements of the layout, such as fixed texts or graphics.
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The form has been changed while being transported.
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The certificate has expired.
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The certificate is not trustworthy. It has not been issued by an accepted Certification Authority (CA).
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The certificate has been revoked. It is included in a Certificate Revocation List (CRL) of the issuing CA.