I find it really funny that it's published on GitHub with the MIT license, but with a disclaimer it's illegal to use it outside of government websites.
It's great that it's publicly available, like many other public stuff the French Government is doing like https://beta.gouv.fr/ or the tax calculators, but it's still funny.
The conditions in the disclaimer only apply to the French government. Translated with Firefox (which apparently still makes some typos):
> Conditions for the use of the Components by the Other Users
> All Other Users are allowed to use the source code according to the terms of the MIT license.
> Other Users are expressly reminded that any use of the Components outside the limits referred to herein or for the purpose of diverting them and otherwise appropriateing the State Mark is punishable by civil and/or criminal sanctions.
Oh, right, on the readme! That's so weird, because it kinda contradicts the "general conditions for use" document. I guess they mean the source code is ok to use but you must alter the design first? The UK's doesn't have such a dumb limitation.
See https://www.systeme-de-design.gouv.fr/ and https://github.com/GouvernementFR/dsfr