Aleksandr Beliakov created PDFBOX-5549:
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Summary: Invisible signature field is not referenced from /Annots
dictionary of a Page
Key: PDFBOX-5549
URL: https://issues.apache.org/jira/browse/PDFBOX-5549
Project: PDFBox
Issue Type: Improvement
Affects Versions: 2.0.27
Reporter: Aleksandr Beliakov
Hello,
Recently we received a complain about not adding a reference to the newly
created signature field to the /Annots array of a page dictionary.
After analyzing the code, we found that PdfBox dependency used in our project,
skips binding of an invisible signature field from a page dictionary. See
[PDDocument.java#L455:|https://github.com/apache/pdfbox/blob/2.0.27/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/PDDocument.java#L455]
{code:java}
if (visualSignature == null)
{
prepareNonVisibleSignature(firstWidget);
return;
} {code}
while adding the signature widget to the given page for visible signature after.
After analyzing ISO 32000-1/2 I was not able to conclude what is the expected
behavior in case of invisible signature. While _/Annots_ array within a page
dictionary is optional and shall contain references to annotations associated
with a page, the chapter "12.5.2 Annotation dictionaries" also tells "{+}_A
given annotation dictionary shall be referenced from the Annots array of only
one page._{+}", which is also ambiguous.
After checking [OpenPDF|https://github.com/LibrePDF/OpenPDF] library, it seems
like they associate an invisible signature field with a first page explicitly
by providing the reference within /Annots array.
Could you please give us information about the rational for skipping the
invisible signature field from adding into a page's /Annots dictionary and
confirm whether the behavior is correct?
Thank you!
Best regards,
Aleksandr.
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