Next was Licensing Models and Building an Open Source Community presented by Eileen Evans at HP. Eileen made a broad generalization about open source licenses – there are two types of licenses: Permissive and copyleft. The question is can a permissive license be used to build an open source community. Originally Eileen felt that the answer was “no”. You needed a contractual reason to make people contribute back to open source. Today though more projects seem to be leaning toward permissive licenses. And so, based on the data, the answer is “yes” a permissive license can be used to create a vibrant open source community.