Hi Markus, The Geogebra download page says "You are free to copy, distribute and transmit GeoGebra for non-commercial purposes. Please see the GeoGebra license for details." The license itself on code is according to the license:"GeoGebra's source code is subject to the GNU General Public License:" So in fact you cannot restrict its use to non-commercial purposes, since that would be a violation of the GPL. Could you please clarify?
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