For example, they have a database from companies which gather information on credit card chargebacks etc. They then create a map linking all charges connected to that address/phone/name/ip lots of other things. I saw a demo and it was incredible, they use data that banks disclose to credit score entities and others.
I'm a verified authorize.net and paypal premier business, in our field of business we are highly susceptible to fraudulent transactions and maxmind doesn't cut it at all. From the webinar I attended and the demoing I went through with IdentityMind I will be able to spot non-friendly fraudsters from a mile away.