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If we remove the Name key before we add the signature fields and the first signature everything runs without any issue. We tracked it down that Adobe Acrobat/Reader simply removes the Name entry from the font dictionary which invalidates the first signature: The resulting document is available here ( ). When you open this document in Adobe Acrobat or Reader and sign the left field the new signature is fine but the previous one is invalid because of changes which were not allowed. Do not wonder, there's really only a single line on the page. This results in a valid document, which you can download here ( ). We add 2 signature fields with our own tool and certify/sign one field. Strangely the font has a Name entry in its dictionary: There's a generated PDF that uses standard fonts which are referenced through the AcroForm default resources entry, too. We just notcied a strange behavior of Acrobat/Adobe Reader (DC 2019.021.20056) and found the root cause:

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