Under the plan unveiled Tuesday by Apple, sales through the new service would be billed through the
Such a service has been widely expected for some time, and Apple teamed up with
However, as part of Tuesday's announcement, Apple said it will no longer allow app publishers to link to outside Web pages to sell content.
Amazon's Kindle app is one of the most popular on the
An Apple spokeswoman said that companies such as Amazon will be allowed to sell e-books from within their apps. But those sales will be subject to Apple's fee requirements, which currently allow Apple to collect 30 percent of the revenue from such sales.
Apple and Amazon became competitors in the e-book business when Apple launched the iPad last April. Apple's iBooks app allows customers to purchase e-books through its own online bookstore.
Many analysts already believe that Amazon sells Kindle content at near-loss in order to build up share of the fast-growing e-book market. The company doesn't disclose specific sales data for the Kindle device or its e-books.
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