Message-ID: <C8BA7F74-FCA9-4B04-976A-0811374611EC@gmail.com>
Date: 2011-04-14T09:01:32Z
From: Peter Dalgaard
Subject: Krylov subspace computations of matrix exponentials
In-Reply-To: <4DA6AD5E.9070200@math.ku.dk>
On Apr 14, 2011, at 10:16 , Niels Richard Hansen wrote:
>
> A third question. There exists a Fortran implementation called Expokit
> with an ad hoc license stating that
>
> "Permission to use, copy, modify, and distribute EXPOKIT and its
> supporting documentation for non-commercial purposes, is hereby
> granted without fee, provided that this permission message and
> copyright notice appear in all copies."
>
> If I choose to use Expokit and just write an interface to R, would
> there be any problems with having such a copyright notice in the package?
>
Probably. GPL and "non-commercial" are incompatible, so you can't distribute anything that mixes the two licenses. R itself has chosen to allow non-GPL packages, although there is a very fine line between a package as a "plug-in" vs. a "derived work".
--
Peter Dalgaard
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Email: pd.mes at cbs.dk Priv: PDalgd at gmail.com