[Libreoffice-bugs] [Bug 38370] [FILEOPEN] LibreOffice Impress do not allow open password-protected PowerPoint presentations in "read-only" mode

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=38370

--- Comment #57 from Eike Rathke <erack at redhat.com> ---
My work was for OOXML password hashing, this seems to be some internal Impress
problem.

If there is a password set for editing and otherwise open the file read-only,
that erroneously fools Impress to believe there is encryption and also prevents
it to open the file in read-only mode.

It's likely only a flag somewhere with an associated password hash for
edit-mode. OOXML PresentationML defines
19.2.1.19 modifyVerifier (Modification Verifier)
that sounds pretty much related and likely has an equivalent in the binary file
format,

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