My English is poor, don't mind it. :)
I have 3 accounts.
Account A(paid)
Account B(free)
Account C(free, i don't use.)
Today I logged in SK with my friend's computer to showed him this game, but I logged in the wrong account.
I logged in Account C, right, the account i don't use. So I logged out account C and logged in account B.
I recommend SK to him, however something was happened.
He created a new account from official website and log in game with this new account.
"You cannot create more free account from this computer". He got the message.