A parasitic marketing technique, which involves intercepting web site traffic to profile ISP user's interests and affiliations (without explicit consent from either the web sites or their users) . Profiled ISP users can then be subjected to targetted advertising for competitor web sites (hence, parasitic marketing). Generally very unpopular with ISP users for legal, privacy and security reasons. Generally rejected by web site owners whose copyrighted content is scanned and abused to promote their rivals.

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