Nauty [1] is pretty much the standard software for graph isomorphism
testing, and is used by a several other pieces of research software
(e.g. polymake, which I have ITPed [2]). Unfortunately from the
Debian point of view, the distribution conditions are somewhat
restrictive.
Copyright (1984-2007) Brendan McKay. All rights
reserved. Permission is hereby given for use and/or
distribution with the exception of sale for profit or
application with nontrivial military significance. You must
not remove this copyright notice, and you must document any
changes that you make to this program. This software is
subject to this copyright only, irrespective of any copyright
attached to any package of which this is a part.
Absolutely no guarantees or warranties are made concerning
the suitability, correctness, or any other aspect of this
program. Any use is at your own risk.
I can ask the author if would distribute under some DFSG free license,
but in the case that he declines, is there any other clarification
needed before it can be included in non-free?
David
PS no-need to CC me, I'll follow the discussion via gmane
[1] http://cs.anu.edu.au/~bdm/nauty/
[2] http://bugs.debian.org/461976
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