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X2Go is free software. Thus, we share the source code of X2Go with everyone and you are allowed to share the code with others, modify the code and also share the modified code with others. There are no limitations in using X2Go. X2Go is free (as in liberty) and will always be. This is our promise to the X2Go user community.
Download released X2Go components as source code from this URL: http://code.x2go.org/releases/source.
Learn how to build X2Go components from source code.
GNU General Public License (GPL): Originally, X2Go has been licensed under the GPL (mostly GPL-2(+).
GNU Affero General Public License (AGPL): Recently, we have started switching to licensing of X2Go components under AGPL-3+.
The difference of the AGPL license compared to the GPL license is: If you offer modified versions of X2Go components as a service on the internet, then the source code of your modified version must be downloadable by the user who is using your service. Furthermore, the source code location of the modified sources must be provided via your offered service itself (e.g. a download URL in the application's ,,About“-Dialog).
Some X2Go components are licensed under some other license (MIT X11, BSD, etc.). Normally, these licenses are less restrictive then the GPL or AGPL. So, when using/deploying/modifying X2Go please make sure you meet the requirements of GPL/AGPL.