LOS ANGELES — An iPod owner is suing Apple Inc., claiming it restricts consumer choice and has monopolized the digital music market because its popular line of music players and its iTunes online music store are not compatible with rival music devices.

The lawsuit, filed Dec. 31 in U.S. District Court in Northern California, seeks class-action status and is the latest of several that claim Cupertino-based Apple has an unfair grip on the online music market.

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