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While the end-user player license remains the same as previous versions, Xonotic has added to it's developers license a no-pedophile rule .
*[1]

Some might say "this isn't a license change". 
A license is permission. Xonotic has voted on, and agreed to this new rule.
It may very well be found by a court to be a license change for developers.

> THEY CAN'T DO THAT
They did.
> THE GPL DOESNT ALLOW THAT!
Got 500k to fight it out?
Also they'll claim their change isn't in the end-user license (but it is an enforced rule, which was voted on and agreed to by the other copyright holders in the Xonotic 0.9 team, and the steering committee): which may amount, by court ruling, to a change in the developer license.
> THIS ISNT A LICENSE CHANGE
It is clear that the community has voted on, including the other copyright holders (though derivative) of various pieces, to enact a no-pedophile rule for Xonotic 0.9 etc.

It cannot be said that it is totally non-enforceable: the copyright holders to the derivative work Xonotic 0.9 (derivative of earlier versions of Xonotic, which is derivative of Nexuiz, which is derivative of an earlier half-life mod, All of which is a derivative work of Quake1 (the engine especially, and much of the Quake C (game) code in Xonotic)), have made clear their feelings about pedophiles working on their project, and have voted to exclude atleast one person.

Darkplaces also, on it's discord, posts a no-pedophile developers rule.[2]
These can be seen as license changes.

They are Additional Writings outside of the original License text that, none-the-less, govern the real-world redaction of the subject Work. They also speak to the intent of the current developers/derivative-copyright-holders. Which is to exclude the class of pedophile programmer and developers. That is the intent of these additional writings.

Additionally these changes have been enforced (Both in Darkplaces*, and Xonotic), which would further enduice the intent and meaning of these added rules to indeed disallow pedophiles from working on the work: https://mircea-kitsune.livejournal.com/27604.html 
:
> a warning to other developers here to be careful, for your team may ban you from working on your own code if someone doesn't like what you said