Iirc portions of posers code such as the face and cloth rooms - are licensed tech. In order to go open source those portions would have to be pulled from the software, in order to prevent licensing violations. And in some cases pulling that tech out of poser may be a violation in itself. Either way it would create issues all around. Any content that relies an that tech would no longer be usable. What good would it serve to break half the content in the software and upset the folks that rely on it.