This is from Sophies FAQ Thread
"If you have been banned for 'Compromised Account', then this means that your account's login credentials have been leaked, and another player's IP has logged into it. When we ban players, we ban all accounts associated with it if they are found to be in possession of over twenty accounts.
Therefore, if you have been banned for 'Compromised Account', then you have not been banned for breaking the rules; your account has been temporarily disallowed from connecting to your server, to prevent a possible hijacker from using illegal modifications on it."
Hope this helps :)