Apple has announced three significant changes to its iTunes Store at Macworld Expo, but the first is undoubtedly the biggest news: The music and video download service, which features more than 10 million songs, is finally going Digital Rights Management (DRM)-free.

No more DRM by the end of March

The iTunes Music Store previously was limited to allowing purchases on the iPhone only over Wi-Fi; that restriction has been lifted, at least for iPhone 3G users, who can now purchase and download content to their iPhones over a 3G connection. That feature is being implemented today, and provides iPhone users with the same price and selection on the iPhone as they would find on iTunes on the Mac or PC.

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