Warner Music Group is making its music available for US downloads from Amazon in MP3 format without copy protection.
Warner had been holding out against using the format because MP3 tracks are easier to share between users and may be freely burned onto CDs. Amazon.com's download store is a major US competitor to Apple's iTunes, which uses Digital Rights Management (DRM) to restrict the use of some of its tracks.
Warner's artists include Led Zeppelin, Aretha Franklin and Sean Paul.
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