I think K Effin' C will try to bully them on this one, as they haven't really a case. They'd be unlikely to win in a court of law, as it's a plain unadorned Standard English phrase. So "Finger Lickin' Good" could be protected, being an uncommon phrase and dropping the G, but "Very Good" couldn't be.

I suspect that KFC renamed themselves because they CAN'T copyright "Kentucky". So any other Kentucky based firm could quite legitimately call themselves Kentucky Chicken, or Kentucky Fried Pet Food.

McDonald's of course try this abuse all the time; here's a case where their bullying lost: McBrat