[Assist] geogebra license is GNU GPL

Isaac David isacdaavid at isacdaavid.info
Sun Dec 27 01:42:09 GMT 2015

Allow me to be more precise:

Geogebra is an instance of copyleft + proprietary dual-licensing, but 
unlike most copyleft + proprietary dual-licensed software Geogebra 
doesn't relicense the copyleft code in order to grant GPL exemptions. 
They rather relicense official binaries to disallow commercial usage, 
but the source code remains free software so someone could in principle 
produce a GPL release. It's all explained here: 

This is a weird license choice, isn't it. Going with a noncommercial 
licence in the source code would serve the developers better. I'm 
inferring that they do own the copyright over the GPL source code, 
otherwise relicensing installers would constitute a GPL violation.

The following is speculation: I suspect Geogebra fell victim of the 
open source narrative in which collaborative development and code 
review are more important than user freedom. Its developers wanted to 
produce an academic and educative piece of proprietary software (gratis 
but not available to businesses) with disclosed source code, but at the 
same time wanted to prevent adaptations from falling off their hands, 
so the best they could come up with was using the GPL and trying to 
make object code noncommercial with a second license.

By the way, not all source code is free. At least translations are 
proprietary (CC-BY-SA-NC). This last license is exactly what I was 
talking about: copyleft sauf commercial usage.

Le sam. 26 déc. 2015 à 18:18, Isaac David 
<isacdaavid at isacdaavid.info> a écrit :
> Some parts are proprietary, unfortunately. The rest is GPL.
> Le sam. 26 déc. 2015 à 14:09, Quiliro Ordóñez Baca 
> <quiliro at riseup.net> a écrit :
>> http://www.geogebra.org/license
>> How is GeoGebra licensed?
>> Says it is GPL.
>> "the source code is licensed under the GNU General Public License"
>> But https://projects.parabola.nu/blacklist.git/tree/blacklist.txt
>> Says it is nonfree:
>> "geogebra::::[nonfree] non commercial license -> 
>> https://geogebra.org/license"
>> --
>> Quiliro Ordóñez 09876 31031 "La gente simplemente 'confía en 
>> mí'. ¡Giles!" -dice Mark Zuckerberg (Presidente de Facebook) 
>> Piensa dos veces antes de ponerte en las manos de Mark.
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