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Reasons for using free General Public Licences
The use of free General Public Licences ensures that future results, developed by any person or institute using an application under the GPL, will remain free and open to the public forever.
Free licences prevent the results from being commercially licenced by other persons or institutions.
Only free licences ensure free access for all.
The use of the model components of XUBetrieb or models derived from XUBetrieb (eg. XUKommunalabwasser) do not force one to licence any part of the resulting interface or application under the GPLv3. Interface or application are not derivative works in terms of GPLv3.
GNU General Public Licence, Version 3 (GPLv3)
The full text of the GNU General Public Licence can be found here.
GNU Free Documentation Licence, Version 1.3
The full text of the GNU Free Documentation Licence can be found here.