“... If you ever decide to switch devices, with IPG you’ll always be able to take your e-books with you. You bought them, you own them, and we’ll always make sure that you have a way to convert your e-books to the latest and greatest devices. Changing devices and platforms shouldn’t mean throwing away your library.”

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In January, Apple released its iBooks 2 app for authoring e-books to be displayed on the iPad. The fine print on the licensing agreement says that any book created with the iBooks authoring app can only be sold in the Apple store, because the program’s proprietary design elements give Apple a stake in the product, and thus the right to tell you what to do with the book you create using it.