Cycles (the blender raytracer) is actually licensed under the Apache License v2.0 -- https://code.blender.org/2013/08/cycles-render-engine-released-with-permis

Cycles (the blender raytracer) is actually licensed under the Apache License v2.0 -- https://code.blender.org/2013/08/cycles-render-engine-released-with-permissive-license/ https://code.blender.org/2013/08/cycles-render-engine-releas... It is being implemented into Rhino at the moment and already has had a release into Poser