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You don't transfer a license; you might transfer copyright ownership, but there's no reason to believe he did so. He probably just gave them a copy of the code, which by default is still his under his copyright, and so they still need a license from him to use it.

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When you contribute to a project, you can not remove it's LICENSE, you can only add more contributors. If you fail to do so, you can add your name on the LICENSE but not claim a DCMA Takedown.

If a project accepts your code, it's their job to add your name to the contributors list. It doesn't matter if you could have done so in your commit; if they're redistributing your code, they have to list you.

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