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Mitch, near all ppc engines have such protection, but nothing is unbeatable. Some of them are victims of their SE partners more than often, but since they have to provide quantity they do not kick them. Sprinks/about for example has some of the most horrible partners, they hitbot like no tommorow. Everytime i mailed them complaining they refunded me for the clicks, but this is not the way you do business with someone. No wonder they have so few advertisers.
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