[mbreese]

If you take a function from a repository (or a sentence from a book), it is the unlicensed use of copyrighted material. Everything in the repository is covered by the license, functions, files… everything.

Whether or not it is infringement depends on if the use can be considered fair use. This is a more nuanced question and is not always clear.

In this case (Copilot) the real question is how transformative the AI training is. Given how verbatim some of the outputs are makes the argument less clear.