Petras created PDFBOX-2892:
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Summary: Invisible signature annotation violates PDF/A
Key: PDFBOX-2892
URL: https://issues.apache.org/jira/browse/PDFBOX-2892
Project: PDFBox
Issue Type: Improvement
Affects Versions: 2.0.0
Reporter: Petras
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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