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BRDF explorer license
https://github.com/wdas/brdf/blob/master/LICENSE
This seems to be permissive, royalty free and granting patents, but derivative work must include its license.
According to the website, it is licensed under MS-PL (Microsoft Public License).
http://www.disneyanimation.com/technology/brdf.html
According wikipedia https://en.wikipedia.org/wiki/Shared_source#Microsoft_Public_License_.28Ms-PL.29 , it is permitted to redistribute binaries with any compatible license, but the source code must be under MS-PL.
One idea we can take from this project, without counting as derivative work, is that analytic BRDFs can be inserted into shader templates.