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Lost in Translation: Rosetta Stone sues Google for Trademark infringement

Rosetta Stone, a foreign language education provider, filed suit against Google in federal court last week for allegedly infringing on the company's trademark.  The conflict arose over Google's AdWords program which allows third parties to purchase keywords for advertising purposes. The result is that when a consumer runs a Google search for "Rosetta Stone", their search results will display paid advertisements of competitors as "sponsored links". What do you thingk, trademark infringement or fair competition?