On Jun 4, 11:21 am, kaimmello <[EMAIL PROTECTED]> wrote:
> On Jun 4, 11:03 am, Michel <[EMAIL PROTECTED]> wrote:
>
> > Personally I think the extra patent protection provided by the GPL3
> > would be a good thing for SAGE and for open source CAS's in general.
>
> I agree with you because algorithms of CAS's can be patented in the
> future and GPLv3 protects againts this
>
> > But I assume this issue depends mainly on the software SAGE itself
> > depends on.
> > I might be mistaken but I think Maxima is GPL2 only.
>
> I think the problem arises only if one merges code from GPLv2 and
> GPLv3...but one program can use the other without problem...
>
> > Michel
>
> > PS. I think the GPL3 is compatible with the Apache licence.
> > This issue came up recently.
>
> Yes, it will probably be compatible in the final release.
>
>
>
I only had a quick look, but currently at least some of the code
carries something like
"Distributed under the terms of the GNU General Public License (GPL)"
as a license note. It is usually customary to write something along
the lines of
This program is free software; you can redistribute it and/or
modify
it under the terms of the GNU General Public License as published
by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT
ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
License for more details.
Relicensing code is difficult unless you have copyright assignment
(which SAGE doesn't) or you are a "young" project with contact to all
(significant) contributers.
Regarding GPL V2 vs. V3 incompability:this is only an issue when you
link against code with the "other" license. In the case of SAGE that
covers at least
* linbox
* pari
* Singular
Cheers,
Michael
--~--~---------~--~----~------------~-------~--~----~
To post to this group, send email to sage-devel@googlegroups.com
To unsubscribe from this group, send email to [EMAIL PROTECTED]
For more options, visit this group at http://groups.google.com/group/sage-devel
URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/
-~----------~----~----~----~------~----~------~--~---
