Re: [AMBER-Developers] PBSA license

From: Ruxi Qi <>
Date: Fri, 17 Mar 2017 13:00:26 -0700

Thanks Hai and Jason for pointing out this! Prof. Luo was considering
changing the license of pbsa to LGPL to resolve the compatibility issue.
We will give it a further check of the code linked to pbsa.



On 3/17/17 12:38, Jason Swails wrote:
> On Fri, Mar 17, 2017 at 2:33 PM, Hai Nguyen <> wrote:
>> Hi,
>> >From AmberTools/LICENSE
>>> The sander and mdgx codes are provided under the GNU Lesser
>> > General Public License, version 3. See GNU_LGPL_v3 in this directory.
>> > (This is to allow libsander and libmdgx to be linked to other programs
>> > that might not be licensed under the GNU GPL.)
>> However, for the regular install, libsander is linked to pbsa, which holds
>> GPL v3 license.
>> Native question: Should we be clear that user should exclude linking to
>> pbsa if he/she wants to use LGPL v3?
> ​Ugh. Mixed licensing should be avoided if possible. sander sans PBSA
> wouldn't even work, so either everything is GPL or everything is L-GPL.
> I recall a conversation regarding Fireball (ca. late July 2015)​ where
> there was some discussion about what licensing to use.
> But I think it's worth deciding on L-GPL (support linking to non-free
> programs) or GPL (and not).
> Note that releasing AmberTools under GPLv2/3 doesn't mean you can't release
> a component separately under L-GPL (as is currently done with ParmEd).
> Good catch, Hai.
> Thanks,
> Jason

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