NBA lockout questions?

Ok, can someone explain to me what David stern is trying to do with this lockout, i have been reading some articles and it seems he wants to do something really evil, also what are the owners and the players trying to agree on. Are the players trying to increase their salary or is it something else, furthermore, why cant players even talk to anybody in their team organization, that seems really ridiculous, i went on the celtics website and all their pictures were gone, why cant they contact their team?