When you set trust players to off, and someone joins your world, you set it to where they can't attack other players. Once that is set, they will not be able to attack you with a sword, their hand, etc. EXCEPT they can still use a bow and when they fire an arrow at you, you still take damage. Before Minecraft 1.2 it never did this, and this is still an on going bug and is annoying because they can kill people without your permission even when they are set not to, as long as they hit them by shooting an arrow with a bow. Please fix this.