You've got this backwards.
Emacs includes python.el, written by Dave Love, about which there is
no legal problem.
python-mode.el is the alternative, which has several contributors
including Andreas R. This has never been included in Emacs.
Please forgive my confusion. I did not remember any of this, so I
tried to figure out the situation from the message I was reading.
Since neither program includes Andreas' code, it seems there is no
legal obstacle to using some or all of python-mode.el in Emacs, except
whether Barry can get a disclaimer from the employers he has worked
for while writing the code.
If it is useful, we could ask a lawyer whether we can get by without
some or all of those disclaimers. The lawyer would need to get more
detailed information from Barry about various things.
It's up to the Emacs maintainers to decide what to do about this. If
they think this legal advice is useful, they should ask me to get it.
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