Microsoft is preparing an upgrade to its anti-piracy technology aimed at bridging the gap that continues to separate online music subscription services and portable devices such as MP3 players. Code-named Mercury, the upgrade will add features to the company's Windows Media digital rights management software that sits on handhelds, MP3 players and similar gadgets. The company has had a version of the software available for portable devices since 1999, but that version has had fewer features than technology Microsoft produces for PCs.
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