[natefinch]

FWIW, there are some (admittedly fairly naive) checks to prevent PII and other sensitive info from being suggested to users. Copilot looks for things like ssh keys, social security numbers, email addresses, etc, and removes them from the suggestions that get sent down to the client.

There's also a setting at https://github.com/settings/copilot (link only works if you've signed up for copilot) that will check any suggestion on the server against hashes of the training set, and block anything that exactly duplicates code in the training set (with a minimum length, so very common code doesn't get completely blocked). Users must choose the value for this setting when they sign up for copilot.

source: I work on copilot at github