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https://issues.apache.org/jira/browse/PDFBOX-4689?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16976143#comment-16976143
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Tilman Hausherr commented on PDFBOX-4689:
-----------------------------------------
I am working on something that creates a small PDF so that it ends up like the
visible signature COSDocument. Because this code path works, unlike the old
(removed) code from a few years ago. It seems to work, see attached signed
document. I haven't tested with the old issue yet.
> 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
> Fix For: 2.0.18, 3.0.0 PDFBox
>
> Attachments: PDFA_signed.pdf
>
>
> 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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