Apple's staunch defence of the iPod ecosystem

The iTunes store accounts for four out of five songs sold on the Internet in the United States and is becoming more important as CDs fade. A milestone was reached last month when Atlantic Records announced digital sales had surpassed CD sales.

Everyone agrees Apple achieved its dominance in music downloads and players with good products and marketing, which makes it entirely legal. Apple is not a monopoly because there are hardware competitors such as Microsoft's Zune.

Nonetheless, rivals and a technology rights group are concerned Apple is overly aggressive.

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