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[Question #683036]: Cannot print PDF with invalid signature

To: qpdfview@xxxxxxxxxxxxxxxxxxx
From: Aziz Chaouch <question683036@xxxxxxxxxxxxxxxxxxxxx>
Date: Mon, 19 Aug 2019 09:13:54 -0000
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New question #683036 on qpdfview:
https://answers.launchpad.net/qpdfview/+question/683036

Hi,

I'm using qpdfview 0.4.18 on Manjaro and I cannot print PDF with invalid signature. When I try to print such a document, I get an error message "Print Error. There was a problem processing document XXX" and the print job is stopped. This doesn't happen with other PDF viewers such as e.g. epdfviewer.  On the other hand qpdfview can print without any issue if the signature is valid.

I can build a PDF with an invalid signature by combining two PDF with different valid signatures using e.g. PDF Arranger. The combined PDF then has an invalid signature. I can check if a PDF has an invalid signature by opening it in LibreOffice Draw. If the PDF has an invalid signature, LibreOffice will complain about it. However it is still possible to print it from LibreOffice Draw. It is only when such PDF is opened in qpdfview that it is not possible to print it. 

Not sure whether this is a bug or not but do you know if this behaviour can be corrected somehow?

Thanks!

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