morlock_man writes "Despite claiming to support the PlaysForSure DRM into the indefinite Future, MS has apparently broken the DRM compatibility with Windows Media Player 11 and Vista. A number of reports are coming in from companies working with the DRM that attempts at playing any music licensed through the PFS DRM under Vista consistently produce errors. Is this an oversight on Microsoft's part? Or are they attempting to cripple their licensed DRM system in favour of supporting their own proprietary Zune business model? Can you say 'Antitrust'?"