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Do I need to provide B&N with my credit card number to use NOOK Simple Touch? What if I'm only reading free eBooks and samples?

Yes. You must have a completed and updated BN.com account to purchase or download paid and free content. This includes an email address, default credit card number, valid expiration date for the credit card, and a current U.S. billing address. Security measures are put in place to protect all of our customers' account information.