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Is your project non-commercial? You can use this[1] official bsd-licensed[2] library for non-commercial projects.

[2] https://github.com/sublee/trueskill/blob/master/LICENSE

If it's BSD licensed, how do they limit it to non-commercial use?

BSD doesn’t have a patent grant, so it would still be protected by patent, even if there’s no copyright restriction on commercial entities using the code.

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