In 2001, goto.com was awarded the patent entitled "system and method for influencing a position on a search result list generated by a computer network search engine". This patent is the heart of PPC advertising technology.In april 2002 , overture sued Google over patent infringement.The lawsuit dragged on for two years, during which yahoo acquired Overture, until it was time for Google to transform into a Public company. Not wanting to go public with a major law suit that threatened its revenue, Google finally settled with Yahoo by issuing 2.7 million share of stock in Exchange for a perpetual license to the patient
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