GPL ensures that any derivatives will also remain open source, permissive licencing permits proprietary derivatives. The benefits of GPL when it comes to deriv

GPL ensures that any derivatives will also remain open source, permissive licencing permits proprietary derivatives. The benefits of GPL when it comes to derivatives is that all the code will remain open, so if someone forks project A into B and make changes, project A can incorporate those changes or maybe everyone jumps onto project B, and perhaps someone will later combine project A and project B into forked project C, etc. Either way the source code of all derivatives remain open. With permissive licencing there is the option of proprietary forks, which means that nothing ensures that any changes made in a proprietary derivative will ever reach the open project. That doesn't mean that no code will be contributed back, but again there's nothing saying it will.