myWIFIzONE? iNTERNET Acces blocker? Working or Not?

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I have seen a site, http://www.mywifizone.com, some says it works if like a ip address or someone like steal my net connection. It blocks it. Have you tried it? and is there a possible software that i can use, so that i block the ones that steal net connection. I wanna make sure my net is not being stolen.