[ProgSoc] GPL and license compatibility

John Elliot jj5 at jj5.net
Mon Aug 15 22:14:25 EST 2011

I've noticed that some projects will dual license their content under 
the GPL *and* some other more liberal license such as the MIT or *BSD 

Is this necessary?

If I'm working on a GPL licensed project and I want to use a library 
that is licensed under a MIT or *BSD license, can I do that? Or do the 
libraries that I'm referencing need to be also licensed under the GPL 
(or LGPL) too?

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