Plan9 been free and open source for over a decade (2003). At first it was released with some very unusual constraints(Lucent Public License v1.0). But those wer

Plan9 been free and open source for over a decade (2003). At first it was released with some very unusual constraints(Lucent Public License v1.0). But those were quickly lifted(Lucent Public License v1.02). GNU's stance on the revised license seems mostly favorable with some mild reservations: http://gplv3.fsf.org/wiki/index.php/Lucent_Public_License_version_1.02 http://gplv3.fsf.org/wiki/index.php/Lucent_Public_License_ve...