What kind of license is the GNU General Public license?
Copyleft
What kind of license is the Apache license?
Permissive
What kind of license is the MIT license?
Permissive
What is a Copyleft license?
A license where modified software must be redistributed with the same license as the original
What is a Permissive license?
A license that carries minimal restrictions on how software can be used, modified, and redistributed