ok there is no real way to stop the people from passing out the freeroll pw by pms as the same perosn wil;l just give it out then to
i to had this problem when i had my forum going on.
the only way to prevent it and it worked was to send a list to the tourney director at said site.then no one wh o is not eligable to play can not play perioed as if your no on the list then you cant play.so it would be my suggestion to make a list of eligable players and send the list to tourney director atr whatever site it is and say these are the people that can play and no one else.maybe they can give a coupon or just make a privat tourney with a list.
it worked for me when i did it.
anyway that will solve all your problems on your pw getting passed around.
just a thought