# Where can I find Gonthier's Coq code proving the four color theorem?

In a 2008 article in the Notices, Georges Gonthier announced a computer-checked proof of the four color theorem using Coq:

Gonthier, Georges. Formal proof—the four-color theorem. Notices Amer. Math. Soc. 55 (2008), no. 11, 1382–1393. PDF

Unfortunately, the article does not seem to provide a link to the Coq code. Where can I find the code? I'm not having any luck with Google.

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@darijgrinberg: Thanks, maybe that should be posted as an answer. It's annoying that it's in a proprietary Microsoft packaging format, but given that Gonthier works for Microsoft I guess maybe I shouldn't be surprised... –  Nate Eldredge May 1 at 23:30

@DavidRoberts: Each file says at the top (c) Copyright Microsoft Corporation and Inria. All rights reserved. I didn't see any further license information. But that makes it look like it's probably not allowed. :-( –  Nate Eldredge May 2 at 3:07