There is no royalty, the reason why Pontiac managed to steal the badge. it stands for Gran Tourismo Omologato.
Guess what... i own the Yank Tank version. A 1967 Royal Bobcat with a dealer optioned 421 engine which I have have restored and slightly modified to the extent to give you enough fright for you to give up worshipping Jap Crap and buy real muscle.
Remember... there is no substitute for cubic inches.