[Libreoffice-bugs] [Bug 141237] Security restrictions not applied while exporting to PDF document

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=141237

--- Comment #9 from Jean-Baptiste Faure <jbfaure at libreoffice.org> ---
(In reply to ricky.tigg from comment #8)
> Each PDF reader's settings are all as defaults. Then Okular's option 'Obey
> DRM limitations' is enabled. Let's keep it accurate; there are
> "restrictions" not "limitations". Here is the Okular starting:
> 
> $ okular <...>.pdf 
> QSocketNotifier: Can only be used with threads started with QThread
> 
> Nevertheless that property should not be a relevant criteria regards to the
> present issue since the presence of Writer's option 'Set passwords...' |
> 'Set permission password', to be kept relevant, has to lock the PDF
> document's settings in order to enforce their appliance when submitted to
> PDF readers.

I disagree. My understanding of the PDF format is that there no mean to enforce
a PDF reader to obey these restrictions.
>From https://en.wikipedia.org/wiki/PDF#Encryption_and_signatures :
> PDF files may also contain embedded DRM restrictions that provide further 
> controls that limit copying, editing or printing. These restrictions depend on 
> the reader software to obey them, so the security they provide is limited.

So for me there is no bug on LibreOffice side as it sets these DRM
restrictions. It s up to the PDF reader to obey them. Or not.

Best regards. JBF

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