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The raid, which took place on Tuesday, concerned accusations by NHN and Daum Communications, two portal operators in South Korea, that Google was limiting their access to smartphones using Android. The two companies claim Google is preventing them from preloading their search portals on the smartphones, giving Google a competitive advantage.
Of course, Google's major motivation to spread the Android OS is to provide more reach to its advertising platform. Google doesn't make any licensing fees from Android.