On Thursday, 21 January 2016 07:16:45 UTC, Jeroen Demeyer wrote:
>
> On 2016-01-21 00:29, Dima Pasechnik wrote:
> > Surely, if the official nauty got another licence it would have solved
> > the problem easier.
>
> Maybe you could ask McKay if he is willing to license *every* version of
> nauty (past and future) with a GPL-compatible license? If we are only
> allowed to ship one specific version of nauty in Sage, we should not
> make it standard since it won't be maintainable.
>
I have asked, and here is his proposed licence for 2.6:
(I have asked him to deal with part D better, too)
This is the copyright notice for the software package Nauty and
Traces, versions 2.6 and later.
Four categories of software are included in the package:
A. All files not listed as B-D below, copyright Brendan McKay (1984-)
B. Files traces.h and traces.h, copyright Adolfo Piperno (2008-)
C. File watercluster2.c, copyright Gunnar Brinkmann (2009-)
D. Files planarity.h and planarity.c, copyright Magma project
(University of Sydney)
Regarding files in classes A, B and C:
Permission is hereby given for the use, distribution and
modification of this software subject to the following.
* You must include this copyright notice with all distributed
copies of this software, including modified copies.
* You must clearly mark modified versions of this software
as differing from the original.
Regarding files in class D:
Permission should be sought from the Magma project.
Regarding all the files in the package:
This software is only provided "as is". No guarantee is made
as to the suitability of this software for any purpose. No
responsibility will be taken by the authors or their employers
for any misfortune which befalls you because of its use. Your
use of this software implies your agreement with this notice.
Brendan McKay: Australian National University; brendan.mc...@anu.edu.au
Adolfo Piperno: University of Rome "Sapienza"; pipe...@di.uniroma1.it
Gunnar Brinkmann: University of Ghent; gunnar.brinkm...@ugent.be
---END-OF-FORMAL-COPYRIGHT-NOTICE---
Earlier (pre-2.6) versions of this package carried a different
notice: "Permission is hereby given for use and/or distribution
with the exception of sale for profit or application with nontrivial
military significance." These days most people use nauty via a
larger package such as Magma, Sage, or GAP, and often they don't
even know they are using nauty. Due to the legal nonsense that
large package distributors need to worry about, it has proved too
much trouble to maintain an idiosyncratic licence. I didn't change
my opinion about military use, but it is no longer part of the
formal notice. Brendan McKay (Jan 20, 2016)
>
> Jeroen.
>
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