File photo of a woman holding up an iPad with the iTunes U app after a news conference introducing a digital textbook service in New York

Reuters
File photo of a woman holding up an iPad with the iTunes U app after a news conference introducing a digital textbook service in New York
A woman holds up an iPad with the iTunes U app after a news conference introducing a digital textbook service in New York in this January 19, 2012, file photo. REUTERS/Shannon Stapleton/Files
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