Maybe this helps [1]. Regardless of the GPL, I understand it this way: If no license is used within a project, in theory, the project must not be used by anyone. So it's probably always a good idea to add a license which fits your needs. It also makes it easier for others to use your project.
HTH, Olaf [1] https://www.gnu.org/licenses/gpl-faq.html#GPLRequireSourcePostedPublic -- Sent from: http://apache-flex-development.2333347.n4.nabble.com/