It looks like a really dangerous precedent of GPL violation in education, so I ask for your help.

I've run into this discussion:

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=692728#37

that states that GeoGebra is a derivative work of SciLab. SciLab is GPL-licensed, and so should be GeoGebra.

But it isn't: https://www.geogebra.org/license/

Even if now GeoGebra is not directly dependent on SciLab, the author of the post states that some version (approx. 4.0.34) is a derivative work from SciLab; thus, GeoGebra 4.0.34 is a GPL software. The current version of GeoGebra is obviously a derivative work of GeoGebra 4.0.34 - and thus it should be under GPL, but it isn't.

In addition to arguments of Stuart Prescott from the link above, I should stress that some source code in GeoGebra repo is marked as non-free:

https://github.com/geogebra/geogebra/blob/master/web/src/main/resources/org/geogebra/web/resources/js/deployggb-template.js

It looks like this JS code is linked to some other JS code generated from GPL-code written in Java; thus, the file above is not under GPL.

See also https://en.wikipedia.org/wiki/Talk%3AGeoGebra


During the Pandemia, such tools as GeoGebra are extremely important for the education around the world. So, it looks like we should do our best to eliminate the GPL violation (if it is really here) and force GeoGebra to publish the code properly.