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Eddy Cue, Apple's Senior Vice President of Internet Software and Services, introduces iTunes Radio at Apple's Worldwide Developer Conference (WWDC) in San Francisco on June 10, 2013. Josh Edelson/AFP/Getty Images ( 520466908 )

Newly updated Apple Macbook Air are displayed on screen during Apple Worldwide Developers Conference (WWDC) 2013 in San Francisco, California June 10, 2013. REUTERS/Stephen Lam ( APPLE/ )

Apple Chief Executive Tim Cook speaks on stage during the Apple Worldwide Developers Conference (WWDC) 2013 in San Francisco, California June 10, 2013. REUTERS/Stephen Lam ( APPLE/ )

Craig Federighi, senior vice president of software engineering at Apple, introduces the new iBooks during the keynote address of the Apple Worldwide Developers Conference, Monday, June 10, 2013, in San Francisco. (AP Photo/Eric Risberg) ( Apple )

Apple CEO Tim Cook speaks about the new iOS 7 during the keynote address of the Apple Worldwide Developers Conference Monday, June 10, 2013, in San Francisco. (AP Photo/Eric Risberg) ( Apple )

Eddy Cue the Apple senior vice president of Internet Software and Services demonstrates the new iTunes Radio during the keynote address of the Apple Worldwide Developers Conference Monday, June 10, 2013 in San Francisco. (AP Photo/Eric Risberg) ( Apple )

Eddy Cue, Apple's Senior Vice President of Internet Software and Services, introduces iTunes Radio at Apple's Worldwide Developer Conference (WWDC) in San Francisco on June 10, 2013. Josh Edelson/AFP/Getty Images ( 520467307 )

Phil Schiller the senior vice president of worldwide marketing at Apple introduces the new MacBook Air laptops during the keynote address of the Apple Worldwide Developers Conference Monday, June 10, 2013 in San Francisco. (AP Photo/Eric Risberg) ( Apple )

Craig Federighi, senior vice president of Software Engineering at Apple demonstrates the new activation lock security feature in iOS 7 during the keynote address of the Apple Worldwide Developers Conference Monday, June 10, 2013 in San Francisco. (AP Photo/Eric Risberg) ( Apple )

Apple Chief Executive Tim Cook speaks during the Apple Worldwide Developers Conference (WWDC) 2013 in San Francisco, California June 10, 2013. REUTERS/Stephen Lam ( APPLE/ )

Apple Chief Executive Tim Cook reacts on stage during the Apple Worldwide Developers Conference (WWDC) 2013 in San Francisco, California June 10, 2013. REUTERS/Stephen Lam ( APPLE/ )

Apple Chief Executive Tim Cook speaks on stage during the Apple Worldwide Developers Conference (WWDC) 2013 in San Francisco, California June 10, 2013. REUTERS/Stephen Lam ( APPLE/ )

Eddy Cue, Apple senior vice president of internet software and services, displays the new iTunes interface during Apple Worldwide Developers Conference (WWDC) 2013 in San Francisco, California June 10, 2013. REUTERS/Stephen Lam ( APPLE/ )

Apple Inc. CEO Tim Cook waves to the crowd during the Apple Worldwide Developers Conference (WWDC) 2013 in San Francisco, California June 10, 2013. REUTERS/Stephen Lam ( APPLE/ )

Phil Schiller the senior vice president of worldwide marketing at Apple introduces the new Mac Pro during the keynote address of the Apple Worldwide Developers Conference Monday, June 10, 2013 in San Francisco. (AP Photo/Eric Risberg) ( Apple )

Craig Federighi, senior vice president of software engineering at Apple, introduces the new OS X Mavericks operating system during the keynote address of the Apple Worldwide Developers Conference, Monday, June 10, 2013, in San Francisco. (AP Photo/Eric Risberg) ( Apple )