Sonos seems to patented the concept of "paired" speakers itself, and the protocol used to synchronize speaker's clocks for synchronous playback. I wonder how B

Sonos seems to patented the concept of "paired" speakers itself, and the protocol used to synchronize speaker's clocks for synchronous playback. I wonder how Bose manages to produce their own multiroom system. Do they license the patents or do they somehow work around them?