Analysis of information sources in references of the Wikipedia article "Basketball court" in English language version.
In the 1997-1998 season, NBA added the "no charge zone" or the "restricted area". This is the portion of the key, denoted by an arc in the painted area that is positioned four feet from the basket. The arc is important because a defending player can not force a charging foul within this area. It was designed to provide benefit offensive post-up player like [Shaquille] O'Neal, players who drive to the basket and limit collisions.