we now have a permission from Brinkmann to release his part of the code 
under whatever license we see fit; 
we already obtained a permission from from Brendan McKay to release nauty 
as a GPLed Sage package, so we
are all set for this to go ahead.

------------------------------------------------------------------------------------------------------------------
Date: Fri, 20 Nov 2015 11:38:26 +0100
From: Gunnar Brinkmann <gunnar.brinkm...@ugent.be>
To: Dima Pasechnik <dmitrii.pasech...@cs.ox.ac.uk>, Jeroen Demeyer 
<jdeme...@cage.ugent.be>
Subject: Code generating finite posets of given size
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 
Thunderbird/38.3.0

Hi Dima,

Jeroen just asked whether I could explicitly declare that it is OK to
use the poset generating code in
Sage. The problem with the (special) nauty file was already solved by
Brendan, so with this mail I declare that
you can also use the (rest of the) poset generating code in Sage under
any license you need to make it available.

Best wishes,

Gunnar

--




Gunnar Brinkmann
Applied Mathematics, Computer Science and Statistics
Ghent University
Krijgslaan 281 - S9
B - 9000 Ghent

email: gunnar.brinkm...@ugent.be

phone: +32-9-264.48.07, Fax: +32-9-264.49.95
-------------------------------------------------------------------------------------------------------------------

On Monday, 29 June 2015 12:30:20 UTC+1, Jori Mäntysalo wrote:
>
> More about licenses, see http://trac.sagemath.org/ticket/14110 . This is 
> a 
> non-technical issue. Who wants to contact the makers of nauty (and poset 
> generation program)? I do not want, as I don't know that much about 
> licenses and copyright issues. 
>
> I am quite sure that they have not really thinked about the restrictions. 
> We don't have just programs anymore, but metaprograms like Sage containing 
> other software. 
>
> -- 
> Jori Mäntysalo 
>

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