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The question is easily answered by checking their FAQ:

> What data has GitHub Copilot been trained on?

> GitHub Copilot is powered by OpenAI Codex, a new AI system created by OpenAI. It has been trained on a selection of English language and source code from publicly available sources, including code in public repositories on GitHub.

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Thanks and sorry to be so lazy (facepalm)...

Who can you verify it is true?

We trust corporations to tell us the truth every day. What do you think the news is.

Everybody knows the news can be charitably described as inaccurate.

Sure, Microsoft Marketing Department says it was trained on public code. The PM probably told them it was.

Was it actually trained on public code only?

I really don't think that's realistic. They would get sued by every single one of their major customers for leaking confidential information.

Because it would be easy to show if there was a counterexample.

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