Method and apparatus for adjusting volume levels in a multi-zone system - https://patents.google.com/patent/US8588949B2/en
System and method for synchronizing operations among a plurality of independently clocked digital data processing devices - https://patents.google.com/patent/US9195258B2/en
Multi-channel pairing in a media system - https://patents.google.com/patent/US9219959B2/en
Playback device - https://patents.google.com/patent/US10209953B2/en
Playback device connection - https://patents.google.com/patent/US10439896B2/en
I'm a big fan of Sonos products but this ruling won't go through, right? Doesn't this effectively make Sonos the only legal manufacturer of wireless speaker systems? It's not like two speakers individually playing L and R channels is a novel concept... Plus it apparently bans imports on "Google Home smart speakers, Pixel phones and computers, and Google’s Chromecast streaming video device".