>I've sued two parties for copyright infringement and won and a third settled out of court for a substantial sum. You don't tell a judge you don't need to prove you wrote the code, that's an automatic loss. Then there are such things as expert witnesses who will interview you and check how much you know about the code you claim you wrote.

This doesn't really make sense; in no way can an "expert" interview definitively assert someone wrote a piece of code or not, especially if the person has access to the code beforehand.