Perhaps Sonos should create an iPod docking unit for the next generation Sonos zone player, which would allow a Sonos network of zone players and controllers to view the songlist and control the ipod. This would allow access to music purchased from iTunes despite Apple's DRM scheme while projecting Apple's legitimate interest to restrict the music to authorized playback units. It would also allow the full use of the sonos controller to access the iPod library rather than just line in input with no remote visibility or control of the iPod's contents.
If Apple says no to licensing such a unit, they are clearly engaging in anticompetitive conduct to promote their own Sonos analog rumored to be under development by taking advantage of their 70% market share of DRM tagged music sales. And if Apple says no then perhaps Microsoft will say yes, allowing Sonos users at least one source to legally purchase and use digital music.