On 25 August 2016 at 11:53, Elmar Stellnberger <estel...@elstel.org> wrote: > Am 2016-08-25 um 10:45 schrieb Gianfranco Costamagna: >> >> I see many GPL-2 similar-looking licenses, with some special exceptions, >> e.g. >> "In addition to the above license, you can relicense this software in >> whatever >> form you want, with a special exception: you can't do foo and bar if you >> change the >> license" > > > The problem about additional GPL-2 clauses seems to be that they can be > dropped at any time. An unpleasant contributor can do so any time and I > would not be able to incorporate his changes if I wanna keep the additional > freedoms I wanna guarantee for the upstream version.
They can be dropped (and, in fact, ignored completely) only if they introduce additional restrictions conficting with the GPL itself. If you're granting additional rights, you're free to grant them only under a certain condition ("you're free to relicence this software under a different license but you must keep this statement in tact"). -- Cheers, Andrew