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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Imports / inclusion of s.el into Emacs
Date: Fri, 01 May 2020 19:01:34 +0300
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Cc: emacs-devel@gnu.org
To: Philippe Vaucher <philippe.vaucher@gmail.com>
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 (message from Philippe Vaucher on Fri, 1 May 2020 17:56:14 +0200)
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> From: Philippe Vaucher <philippe.vaucher@gmail.com>
> Date: Fri, 1 May 2020 17:56:14 +0200
> Cc: Emacs developers <emacs-devel@gnu.org>
> 
>  If you copy someone's code, the code is still theirs, and we need both
>  a permission from them to use it and a copyright assignment to include
>  that in Emacs.
> 
>  If we are thinking about reimplementing those function, then the
>  person who is reimplementing is well advised not to look at all at the
>  original code, but just work from requirements or from an idea of the
>  implementation described by someone else.
> 
> Got it. And implementing those `string-*` functions using `s.el` is not possible, because that's require `s.el`
> being distributed with Emacs which would require copyright assignments, correct?

Yes.