On Mon, Feb 6, 2017 at 2:11 PM Ondřej Čertík <[email protected]>
wrote:

> On Mon, Feb 6, 2017 at 11:49 AM, Francesco Bonazzi
> <[email protected]> wrote:
> >
> >
> > On Monday, 6 February 2017 18:09:42 UTC+1, Ondřej Čertík wrote:
> >>
> >>
> >> >
> >> > What do you think? Shall we edit our LICENSE file to include Sergey
> >> > Kirpichev and diofant?
> >>
> >> No, not in the main license, as Sergey only owns the copyright of his
> >> own contributions, not the whole SymPy. However, I already submitted a
> >> PR with adding his license underneath:
> >>
> >> https://github.com/sympy/sympy/pull/10531
> >>
> >> I also asked Sergey whether he is ok with such an arrangement going
> >> forward, but he never replied. He did give permission for that
> >> particular PR though. I think the BSD license clearly allows to use
> >> his work, as long as we copy his license somewhere in our
> >> documentation/repository, so I am not against merging #10531 and keep
> >> porting his fixes. But it's always better to have his permission that
> >> he is ok with such an arrangement.
> >
> >
> > I wrote to him and he replied that he would like his work to be cited if
> it
> > is going to be merged back into SymPy.
> >
> > I think this edit:
> >
> https://github.com/certik/sympy/blob/400335e280623af611d583f84b1ac5d450f4f7f5/LICENSE
> >
> > is enough to fulfill Kirpichev's wishes.
>
> I certainly tried my best to satisfy both the BSD license and Sergey's
> wishes, but if you can obtain Sergey's explicit approval of such an
> arrangement, that would be great, and I would have no problems going
> ahead and merging that PR and other fixes. Specifically what I do not
> want to happen is a situation when the BSD license was perhaps
> followed, but the result was not what Sergey intended, and he would
> feel that we stole his work. In other words, merging code to SymPy's
> master against the original author's will is questionable (ethically
> and perhaps even legally, I am not sure).


It wouldn't be illegal. That's the whole point of the BSD. You give up full
rights to your code. However, Sergey could change the license (for future
code), and I think he has also stated that he only licenses code once it is
merged into master. So I agree it is best to get his general permission.

Aaron Meurer


>
> So if you could obtain Sergey's permission, then we can go ahead, as
> far as I am concerned.
>
> Ondrej
>
> >
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