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https://issues.apache.org/jira/browse/PDFBOX-2892?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Petras updated PDFBOX-2892:
---------------------------
Flags: Patch
Labels: PDF/A Signature (was: )
Component/s: Signing
> Invisible signature annotation violates PDF/A
> ---------------------------------------------
>
> Key: PDFBOX-2892
> URL: https://issues.apache.org/jira/browse/PDFBOX-2892
> Project: PDFBox
> Issue Type: Improvement
> Components: Signing
> Affects Versions: 2.0.0
> Reporter: Petras
> Labels: PDF/A, Signature
> Attachments:
> Patch_to_create_PDF_A_conformant_invisible_signature_annotation_dictionary_.patch
>
>
> Using PDFBox v2.0 snapshot I tried to sign PDF/A document with invisible
> signature. I noticed that invisible signature annotation dictionary, when
> signature has been created with this method
> {{PDDocument#addSignature(:PDSignature, :SignatureInterface)}}, is created
> with *F* key’s *NoView* flag bit set to 1 in Widget annotation dictionary
> (see: {{PDDocument.java#247}}):
> {code:java}
> // set visibility flags
> if (options.getVisualSignature() == null)
> {
> signatureField.getWidgets().get(0).setNoView(true);
> }
> {code}
> The use of this flag is redundant for making signature field invisible. As
> ISO 32000 states:
> bq. Signature fields that are not intended to be visible shall have an
> annotation rectangle that has zero height and width. Conforming readers shall
> treat such signatures as not visible.
> Besides, the use of this flag violates PDF/A-1 (and PDF/A-2) requirements for
> Annotation dictionary F key:
> bq. The F key’s Print flag bit shall be set to 1 and its Hidden, Invisible
> and NoView flag bits shall be set to 0.
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