Jeff Bezos, founder and CEO of Amazon.com, introduces the Kindle at a news conference in New York in this Nov. 19, 2007 file photo. Amazon.com releases quarterly earnings after the closing bell on Wednesday, Jan. 30, 2008.

A screenshot from Amazon.com's digital music store. Amazon said on Sunday it will begin an international roll-out this year of its digital music store that offers songs without copy-protection technology known as digital rights management.