What we have here is 1) A rule change 2) Additional Writings being Published regarding the new terms. 3) An enforcement action following the new terms. 4) The effect seen from the licensee: which is to bar them from development of a formally-GPL Property. 5) Expressions that pedophiles are not wanted to edit the code base. 6) And that Policy being put into effect and it having the desired outcome.
[Note: The original author and copyright owner to both DarkPlaces C code and the Xonotic QC code is John Carmack, ID software. Both DarkPlaces and Xonotic QuakeC code are derivative of Quake1 C and QuakeC code. Regardless of how many times they were "rewritten". Even a rewritten section is a derivative work of the original. Quake1 was released as GPL without developer restrictions of any kind, and without any additional stipulations or sections]
