Apple computers has modified its iPod technology in order to prevent RealNetworks’ Harmony software from undercutting its service and profiting off iPod download revenue, according to reports.

Internet music store, RealNetworks, had launched the Harmony program to enable consumers to download music directly onto their iPods without having to pay Apple or the iTunes music site.

But Apple has accused RealNetworks of employing “hacking” tactics to embezzle profits.

The iPod photo was the central target for RealNetworks but technological modifications have now supposedly removed the compatibility of Harmony with this music device.

This development represents the latest of a number of high-profile disputes between RealNetworks and Apple dating back to April when Apple chief executive Steve Jobs turned down a request from RealNetworks chief executive Rob Glaser to open up the iPod to RealNetworks’ music.