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Re: [Toon-members] TooN license on Savannah

From: E. Rosten
Subject: Re: [Toon-members] TooN license on Savannah
Date: Thu, 6 May 2010 10:48:01 +0100 (BST)
User-agent: Alpine 2.00 (LSU 1167 2008-08-23)

On Wed, 5 May 2010, Gerhard Reitmayr wrote:

hmmmm, I don't get the wording of that either. linking -> GPL, but linking -> 
do what you want :)

I am two minds about licenses for TooN/libcvd...

On the one hand, I think that companies can replicate the functionality in 
TooN, if they want to. so a more liberal license would be ok to just support 
its uptake.

On the other hand, the LGPL/GPL licensing of TooN already created some offers 
at least for Cambridge which might otherwise not be made.

This makes me want to stick with the GPL with exceptions. The license is liberal enough (enough companies use GCC). I think that the (L)GPL is now widespread enough, with enough companies using it that it will make less and less difference as time goes on.

So I can't really decide... looks like the GPL way does help...

I've had this debate with myself a number of times. The recent events have made me settle in favour of the GPL.



On 5 May 2010, at 17:46, Simon Taylor wrote:

Georg Klein wrote:
Hey folks,

the savannah page still has TooN listed as LGPL, and this can't be
changed, you have to contact the savannah admins. Any objections to me
doing this?

I'm not quite sure where Ed got the new TooN license from. I think the
spirit of it is "if you use it unmodified then do whatever you want with
it, but you must submit any modifications to us".

However the TooN COPYING file says:
[...GPL v2 blah...]
As a special exception, you may use these files as part of a free
software library without restriction. [...]
Note the *free software* in the last sentence, which seemingly forbids
commercial use.

It seems to me the exception we want is the same as the GNU Classpath
(Java base classes):

Linking this library statically or dynamically with other modules is
making a combined work based on this library. Thus, the terms and
conditions of the GNU General Public License cover the whole combination.

As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
modules, and to copy and distribute the resulting executable under terms
of your choice, provided that you also meet, for each linked independent
module, the terms and conditions of the license of that module. An
independent module is a module which is not derived from or based on
this library. If you modify this library, you may extend this exception
to your version of the library, but you are not obligated to do so. If
you do not wish to do so, delete this exception statement from your version.

I suppose one could argue that as TooN is all templates, the terminology
of "linking this library" doesn't really apply though.


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Gerhard Reitmayr
Institute for Computer Graphics and Vision
tel: ++43 316 873 5082

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