Sony opens up e-book Reader to other booksellers

With the market for electronic books still relatively sleepy, Sony Corp. is trying a new tack: untethering the latest model of its e-book reading device from its own online bookstore.

On Thursday, Sony will provide a software update to the Reader, a thin slab with a 6-inch screen, so the device can display books encoded in a format being adopted by several large publishers. That means Reader owners will be able to buy electronic books from stores other than Sony’s.