http://www.theregister.co.uk/2007/10/03/performance_pricing_sues_google_aol_yahoo_microsoft/
A Texas company has sued AOL, Google, Microsoft, and Yahoo, claiming that all four web giants have infringed its patent "for conducting business transactions over the Internet".
Performance Pricing Inc. filed suit last week in the Eastern District of Texas, Marshall Division, a popular place for patent infringement suits. The company insists that four of the biggest names on the net are stepping on its patent with their ad technologies, including Google AdWords, Microsoft adCenter, Yahoo! Search Marketing, and the Google-powered AOL Search Marketplace.
Here is the patent:
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