Add advice on copyright notices and PRs by hugovk · Pull Request #1470 · python/devguide

You should also add a note that for most code in the PSF CPython distribution, the PSF does not own the copyright, but only has redistribution rights to that code, so randomly applying the PSF copyright notice is often plain wrong.

There were a few copyright assignments in the past, but I'm not sure whether we really have a complete list of those. Only code which falls under one of these assignments is legally copyrighted by the PSF.

Note that the PSF does own the copyright on the CPython distributions, i.e. the compilation of the files which make up CPython, which is why there is a copyright statement in the README and the LICENSE.