Gee, can someone make mods to SA and place them only under the GPL, and thus create a branch of SA which is only under the GPL? The license notices should be modified to indicate which version this is.SA is licensed under the same terms as Perl itself, this means a dual GPL / Artistic license. The Artistic license permits to keep modifications to the licensed code proprietary.
The author of the mods which are placed under the GPL can also release the mods to the Public Domain or use different executable names, so as to meet the Artistic License requirements. It looks like the Artistic License only requires that mods be made PD, and that could be done by the mod author releasing ONLY A DIFF FILE to the PD. Note that Public Domain is different from a licensed version. The Artistic License does not seem to require that modifications be released under the Artistic License, so the author of the GPL-only mods can choose whether or not to release a version under his Artistic License.
It wouldn't block anyone from patching a GPL/Artistic copy if they want to maintain the original branch -- but they'll have to update the proper license notices.
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