Well, there's a big question as to whether non-GPL can link to GPL code.
It's never been really tested in court. If I were you, I'd just make it
open-source and sell your support for it.

On Sun, May 11, 2008 at 5:19 AM, Serge Merzliakov <smerzlia@optusnet.com.au>
wrote:

> All,
>  I am interested in devloping a commercial java-based (why the language is
> important is discussed later) GUI for R. The app would allow the GUI to edit
> R commands and the results displayed in varios means. I have investigated
> various java based libraries to invoke R and they follow the apache license
> model (friendlier to commercial software developers). I understand the that
> R is released under the GPL license, which I have a reasonable understanding
> of.  SO my question is simple, Can I develop a a commerical GUI for R (which
> would require R to be isntalled separately on the machine) without having to
> also release my source code ?
>
> I am hoping that some of core R development team see this and can provide
> useful feedback.
>
> Regards,
> Serge
>
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> https://stat.ethz.ch/mailman/listinfo/r-sig-gui
>

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