Re: Emacs-Lua: question about the license of one file

[Eli Zaretskii <eliz@gnu.org>]

> From: Eduardo Ochs <eduardoochs@gmail.com>
> Date: Tue, 7 Sep 2021 01:09:04 -0300
> 
> I am working on a package that contains a module written in C++ that
> loads a Lua interpreter, and that implements a REPL that lets us run
> that interpreter interactively from Emacs. It is here:
> 
>   https://github.com/edrx/emacs-lua
> 
> At this moment my package is just a poorly-documented prototype, but I
> would like to submit it to ELPA when it grows up.
> 
> QUESTION. The code in the module in C++ was written by a guy who sent
> it to the Lua mailing list. His message is here:
> 
>   http://lua-users.org/lists/lua-l/2021-03/msg00084.html
> 
> Here is my version of his code:
> 
>   https://raw.githubusercontent.com/edrx/emacs-lua/main/emlua.cpp
>   http://angg.twu.net/emacs-lua/emlua.cpp.html
>   http://angg.twu.net/emacs-lua/emlua.cpp
> 
> When my REPL became functional I sent him an e-mail saying that I
> would like to prepare the package to submit it to ELPA in the future,
> and asked him what he thought about doing the paperwork thing... and I
> told him that if he preferred a paperworkless way that _I guessed_
> that he could just send an e-mail to the Lua mailing list declaring
> his code to be in the public domain, but I would have to check that
> possibility with people who are more knowledgeable than me - and he
> said something equivalent to "wow, yes, great, please check!"...
> 
> So: can we do that? And are there any other licenses that you would
> recommend besides public domain?

I think using a PD code may also need some paperwork, some kind of
disclaimer?  Richard, what are the rules in these cases?