Daniel Gorelic created PDFBOX-4995:
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Summary: Multiple PDF signatures with image
Key: PDFBOX-4995
URL: https://issues.apache.org/jira/browse/PDFBOX-4995
Project: PDFBox
Issue Type: Bug
Affects Versions: 2.0.20
Reporter: Daniel Gorelic
Attachments: signed.pdf
A second PDF signature with an image invalidates the first one. If there is no
image, the first signature remains valid.
This is what DSS team member wrote:
Indeed this appears to be a PDFBox bug: One indirect object from the original
document revision is completely unnecessarily overwritten in each signed
revision with an object with the identical content. In spite of this not
actually changing the page content, Adobe Reader apparently considers this
suspicious enough to claim a document change and signature invalidation.
The object in question is the object 54 0 which is a color space resource for
each of the three document pages:
{code:java}
54 0 obj
/DeviceGray
endobj {code}
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