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From "Stefan Strobl (Jira)" <j...@apache.org>
Subject [jira] [Created] (PDFBOX-4689) Invisible Signature should have empty Appearance Dictionary
Date Thu, 14 Nov 2019 04:24:00 GMT
Stefan Strobl created PDFBOX-4689:

             Summary: Invisible Signature should have empty Appearance Dictionary
                 Key: PDFBOX-4689
                 URL: https://issues.apache.org/jira/browse/PDFBOX-4689
             Project: PDFBox
          Issue Type: Improvement
          Components: Signing
    Affects Versions: 2.0.17
            Reporter: Stefan Strobl

According to TechNote 0006: Digital Signatures in PDF/A-1
[http://www.pdfa.org/wp-content/uploads/2011/08/tn0006_digital_signatures_in_pdfa-1_2008-03-141.pdf] Section
2.4 "The visual appearance must also exist for an invisible signature but may be empty." 

This should be easily handled by modifying PDDocument as indicated below:
private void prepareNonVisibleSignature(PDSignatureField signatureField)
        throws IOException
    // "Signature fields that are not intended to be visible shall
    // have an annotation rectangle that has zero height and width."
    // Set rectangle for non-visual signature to rectangle array [ 0 0 0 0 ]
    signatureField.getWidgets().get(0).setRectangle(new PDRectangle());
+    signatureField.getWidgets().get(0).setAppearance(new PDAppearanceDictionary());

If this is an acceptable solution I would be happy to provide a PR

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