GeoGebra Language Files License
GeoGebra, office@geogebra.org

All GeoGebra language files (*.properties files) are subject
to the following Creative Commons Attribution-NonCommercial-NoDerivs 3.0
License:

You are free to copy, distribute and transmit GeoGebra language files
free of charge under the following conditions:
* Attribution. You must attribute the work
(i.e. by linking to http://www.geogebra.org/)
* NonCommercial. You may not use this work for commercial purposes
without permission of GeoGebra (office@geogebra.org).
* No Derivative Works. You may not alter, transform, or build upon
this work.

The Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
can be found at: http://creativecommons.org/licenses/by-nc-nd/3.0/

Translations
Translations of GeoGebra installers, language files or documentation
files are only allowed with permission of their respective authors.
Resulting translations are subject to the same copyright as the
original work (i.e. copyright of the original authors and Creative
Commons Attribution-NonCommercial-NoDerivs license).
The translators have the right to be attributed by name and contact
address in their translated work. Furthermore, translated GeoGebra
documentation files may not be used for commercial purposes without
permission of the original authors and the respective translators.

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Note concerning GeoGebra GNU GPL source code license:

GeoGebra's source code is licensed under GNU GPL and fully
functional without these language files. The language files
are a plugin for GeoGebra under the abovementioned CC license.