I would love to give you more precise details, but from what I gathered it was probably a mass ContentID claim. I do not recall if he was able to make a counter

I would love to give you more precise details, but from what I gathered it was probably a mass ContentID claim. I do not recall if he was able to make a counter claim, because (at least as he told me) his account was suspended and he was unable to get to it. I did not know enough about the YouTube process at the time to get any more specific details, but I do know that he had a lawyer retained.