The Norwegian hacker famed for developing DVD encryption-cracking software has apparently struck again--this time breaking the locks on Apple Computer Inc.'s wireless music-streaming technology.

Johansen, an open-source advocate, has been critical of Apple's proprietary system, which largely restricts Apple's hardware and software products to work only with each other.

On his Web site, for instance, Johansen praised a newly developed technology by RealNetworks Inc. that will make songs from its online music service compatible with the market-dominating Apple iPod portable music player.

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