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>Everything at the GPUOpen portal will be open source and licensed under the highly permissive MIT license, allowing developers to not only see the code behind RTG’s tools and libraries, but to integrate that code into open and closed source projects as they see fit.

http://www.anandtech.com/show/9853/amd-gpuopen-linux-open-so...

While the i915 driver nowadays lives in the Linux source tree, it is still released under a permissive license. Same goes for a lot of drm stuff. I'd assume similar for radeon.

Most of DRM is MIT licensed, including these two drivers.

The drivers for desktop GPUs are MIT licenced, most of the others seem to be GPL.