I'm having an issue with a PDF while trying to retrieve an existing signature field in the document.
I'm using the method PDDocument.getSignatureFields() which return PDSignatureField objects on some PDF, but nothing on others which I'm sure they have signature fields.
One of those PDF is attached to the ticket. The signature field contained in the document can be signed on Adobe Reader and in a other close sourced commercial library. But on PDFBox, the signature field does not exist.
Is it an issue or a known limitation of the library or I did I miss something ?