The Lawsuit claims:
Google gained knowledge of Sonos’s patented multi-room technology through a partnership with Sonos to integrate Google Play Music into the Sonos platform. However, just two years later in 2015, Google began willfully infringing Sonos’s patents when it launched its first wireless multi-room audio product – Chromecast Audio.Read More https://www.cepro.com/audio-video/sonos-google-patent-lawsuit/