Sony on Tuesday launched its online music store, throwing its hat into a ring that has been dominated for a year by Apple Computer's iTunes.
As a competitor with significant resources--and a long list of music devices with which it hopes to rival the iPod--Sony's entry into the market could help change the dynamics of digital music sales. But Sony could also complicate the market for consumers, by selling music in yet another copy-protected technological format that is incompatible with any of the other services
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