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https://issues.apache.org/jira/browse/PDFBOX-4689?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16974504#comment-16974504
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Michael Klink commented on PDFBOX-4689:
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PDFBox PDF/A validation started requiring that annotation recently. See DSS-1815
> 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
> Priority: Major
>
> 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:
> {code:java}
> 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());
> }
> {code}
> If this is an acceptable solution I would be happy to provide a PR
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