They're currently doing this automatically for catching exact matches, and you can turn on a setting that will suppress any suggestion that was found verbatim i

They're currently doing this automatically for catching exact matches, and you can turn on a setting that will suppress any suggestion that was found verbatim in the training data. But of course this wouldn't catch copies where variable names have been changed, etc. One thing that I think would be really interesting (but hideously computationally expensive) is to compute an embedding of each chunk of the training data and then query for the k nearest neighbors when Copilot generates some code, so you can see what the closest snippets in the training data are and evaluate for yourself if they're too similar.