 The most @-@ commonly enforced rule on the key is the " three seconds rule " in which a player from the offensive team is prohibited from staying on the key for more than three seconds , or else the player 's team will lose possession of the ball . Another rule enforced is the lane violation in which players from both teams are prohibited to enter the lane until after the free throw shooter releases the ball from his hands ( the shooter is prohibited to enter the key until after the ball hits the rim ) . An 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 . 
 The most @-@ commonly enforced rule on the key <a href='drop_aux' title='1'><mark>is</mark></a>the " three seconds rule " in which a player from the offensive team is prohibited from staying on the key for more than three seconds , or else the player <a href='null_genetive' title='2'><mark>'s</mark></a>team will lose possession of the ball . Another rule enforced is the lane violation in which players from both teams are prohibited to enter the lane until after the free throw shooter <a href='uninflect' title='3'><mark>releases</mark></a> the ball from his hands ( the shooter is prohibited to enter the key until after the ball <a href='uninflect' title='4'><mark>hits</mark></a> the rim ) . An innovation <a href='drop_aux' title='5'><mark>is</mark></a>the introduction of the restricted area arc directly underneath the basket where the defending player cannot force an offensive foul on the opposing player . 
Da most @-@ commonly enforced rule on the key tda" three secs rule " in which a player from thdaffensive team is prohibited from stayin on the key for more den three seconds , or else the player  team gon lose possession of the ball . Another rule enforced is thedane violation in which players from both teams are prohibited to enter the lane untill after the free throw shooter release the dal from his hands ( the sdater is prohibited to enter the kedantil after the ball hit the rim ) . An innovation the introduction of the resdacted area arc directly underneath the baskdawhere the defending player cannot force an offensive foul on the opposda player .