So I was looking at the ITU-Ts reference codec library, published as G.191, which is under the pictured license.

And part way through I thought to myself “wait. this text is familiar. The ITU-T Software Tools General Public License is just a slightly modified version of the GPLv2”. And if you look at them side by side this is obviously true.

Now, the text of the GPLv2 famously starts with the following text:

Version 2, June 1991

Copyright (C) 1989, 1991 Free Software Foundation, Inc.
https://fsf.org/
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.

The GPLv2 is a work that the FSF claims copyright over, and I am not aware of any exception which would cause it to be non-elegible for copyright, and notably the FSF explicitly do not permit modification.

…which sort of implies that (unless they sought permission from the FSF) the ITU-T is infringing on the FSF’s copyright?!