The most-commonly enforced rule on the key is the "three seconds rule" in which the team of a player on offense who stays on the key for more than three seconds loses possession of the ball. Another rule is the lane violation which occurs if a player from either team enters the key before a free-throw shooter releases the ball in the act of shooting. A recent innovation is the introduction of the restricted area arc directly underneath the basket where the defending player cannot force an offensive foul on the opposing player.