@downey Throw in a GPL license and it's free labor for everyone. Everyone benefits by using the GPL.
@nifker @downey However, in the software world, where once info is modified, it can be relicensed at will. This means that if a peice of software requires spurce code distribution but allows relicensing, a big company can come along, duplicate the work, extend it with features and antifeatures and publish it without the source code and a new license. This is far from ideal and harms people.
@nifker @downey This is where copyleft comes in. Copyleft is one small restriction which states that code cannot be relicensed. It must retain the same license it was distributed with. This restriction prevents the previous issue from occouring and modifications to software by any entity can be added or rejected by the community, making it by far the gold standard of software licensing. This benefits everyone in the long run.
The main thing is the copyleft nature. A long time ago, we very quickly discovered that once info was either a public domain dedication or was licenced with an unrestricted license, it could benefit everyone.
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