[Coin-discuss] [Coin-announce] IBM passes open-source license baton to Eclipse

[Matthew Saltzman]

On Sat, 2009-04-18 at 07:48 +0200, Soeren Sonnenburg wrote:
> On Fri, 2009-04-17 at 13:10 -0400, Laszlo Ladanyi wrote:
> > CPL (and EPL) are not proprietary. It is open source and is approved 
> > by the Open Source Initiative, moreover as it's in the OSI's list of 
> > "Licenses that are popular and widely used or with strong 
> > communities". However, it is incompatible with the GPL. According to 
> > http://www.gnu.org/philosophy/license-list.html#GPLIncompatibleLicenses 
> > the incompatibility arises from a "choice of law" clause (the license 
> > is governed b ythe laws of NY) and because it has "weak copyleft" (I'm 
> > not sure exactly what that is).
> 
> Copyleft denotes that whenever something got released under that license
> derivative works needs to be released under the same license. To my
> understanding that is the case with the GPL,LGPL,MPL,CPL,EPL. So they
> all conflict (LGPL has an extra clause though that it is OK at any time
> to 'upgrade' to GPL).
> 
> You probably know that M$ calls 'copyleft licenses' viral licenses.
> Anyway, 'weak' potentially stands for can included in closed source
> products. IMHO a bit weird to not allow going in the 'more open'
> direction by conflicting with the GPL though...

Let's be clear here: it's the conditions in the GPL that prevent
distribution of combined works when the licenses are incompatible.
That's what "strong copyleft" means.

> 
> Soeren.
> 
> > --Laci
> > 
> > On Fri, 17 Apr 2009, Andrew Makhorin wrote:
> > 
> > > Sorry for my possible misunderstanding.
> > >
> > > I am just wondering if the Eclipse Public License (EPL) makes the
> > > Coin-OR software compatible with the GNU GPL license, or nevertheless
> > > the Coin-OR remains proprietary. Thanks.
> > >
> > >
> > > Andrew Makhorin
> > >
> > >
> > > _______________________________________________
> > > Coin-discuss mailing list
> > > Coin-discuss at list.coin-or.org
> > > http://list.coin-or.org/mailman/listinfo/coin-discuss
> > >
> > 
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> > http://list.coin-or.org/mailman/listinfo/coin-discuss
> 
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-- 
                Matthew Saltzman

Clemson University Math Sciences
mjs AT clemson DOT edu
http://www.math.clemson.edu/~mjs