[Interest] Mixing Commercial and Open Source license for different projects

[Florian Bruhin]

Hey,

On Mon, Mar 15, 2021 at 04:16:53PM +0100, James Maxwell wrote:
> If I have a commercial Qt license, can I still develop for projects
> which are going to be released under LGPL where also other people
> don't have a Qt license (of course assuming we only use LGPL Qt and
> nothing of the commercial only parts).
> 
> I am afraid of the following: "(ii) use Licensed Software for creation of
> any software created with or incorporating Open Source Qt"
> what does licensed software mean? If I have Qt commercial, do I always use
> Qt under commercial license and thus cannot create any software using open
> source qt?

The license text has a definition of "Licensed Software". Most notably,
"Licensed Software does not include [...] Open Source Qt.".

FWIW the licensing FAQ[1] says:

    Mixing Qt commercial licenses with Qt open-source licenses *in one
    project/product* is not permitted.

(emphasis mine), and in the earlier discussion here[2], Tuukka Turunen
said:

    For completely independent projects/products this is fine. Note that
    these really should not be same or in practice the same - or in any
    way depending, relating, using etc each other as defined in the
    license agreement. 

That all being said, I'm not a lawyer, and I'm not associated with
The Qt Company in any way.

Florian

[1] https://www.qt.io/faq/2.7.-can-some-developers-in-our-team-working-on-the-same-project-use-open-source-version-of-qt-and-some-developers-use-commercial-version-of-qt
[2] https://lists.qt-project.org/pipermail/interest/2020-March/034786.html

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