referrals in my own house and in internet cafe, library

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well I want to invite my brother but we are using the same IP address. is there any rule that I'm going to violate? and I'm going also invite my friend but they use internet cafe and liblary and I'm afraid they might get banned if that internet cafe already registered its IP add in mylot. need help. please indicate a real situation that you and your house mate still receive your earnings even your using the same IP and probably computer. thanks