For example, the Forza Motorsport series includes realistic models of numerous existing car models which are licensed from the car manufacturers. These licensing terms are limited, requiring publisher Microsoft to pull the game from sale roughly four years after release; Microsoft has generally established a development model where as the last iteration of Forza is about to be pulled, the next version, with a fresh start on the car licenses, was released.[59] In one predominate example, Grand Theft Auto IV had to update the game for all digital owners to remove songs on the soundtrack which their ten-year license had expired.[60]