A debate has raged for years on whether to allow companies to buy keywords based on trademark words. Beginning in March, both Microsoft and Yahoo will allow advertisers to buy paid search trademark keywords, according to Joe Mullin. He tells us Google has allowed ads keyed off trademarked keywords in the U.S. for several years, and expanded the policy worldwide in 2009. Aside from the trademark issue, Mullin runs down other legal battles Google has fought, "where competitors were too timid to take on the challenge, but will benefit nonetheless."
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