WSJ.com: Apple Antitrust Issues Raised by Subscription-Service Terms
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"Apple Inc.'s new subscription service could draw antitrust scrutiny, according to law professors. ... Publishers, for example, might claim that Apple dominates the market for consumer tablet computers and that it has allegedly used that commanding position to restrict competition. Apple, in turn, might define the market to include all digital and print media, and counter that any publisher not happy with Apple's terms is free to still reach its customers through many other print and digital outlets."