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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Question: using public domain code?
Date: Tue, 07 Sep 2021 09:37:57 +0300
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To: Qiantan Hong <qhong@mit.edu>
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 Qiantan Hong on Tue, 7 Sep 2021 05:30:41 +0000)
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> From: Qiantan Hong <qhong@mit.edu>
> Date: Tue, 7 Sep 2021 05:30:41 +0000
> Cc: Emacs Devel <emacs-devel@gnu.org>
> 
> I guess GPL3 would need copyright assignment from original author 
> (that’s why we all need to do the paperwork!).

Yes, we need copyright assignment for non-trivial code.  If the code
is small enough, we could accept it without an assignment, but AFAIU
we'd still need the author to tell explicitly he or she agrees to
submit the code to Emacs.