https://www.techdirt.com/articles/20180405/06423339567/patent-troll-sues-spotify-soundcloud-deezer-over-patent-music-organizer-entertainment-center.shtml

Another day, another story of another patent troll. This one is about MOAEC Technologies LLC, a "patent licensing" company that exists solely around four related patents for a "music organizer and entertainment center." Last month, MOAEC sued Spotify, SoundCloud and Deezer over these patents. It's interesting that the lawsuit came just a few weeks before Spotify's IPO, as we've seen a bunch of companies sued for patent infringement right before their IPOs -- but it didn't prevent Spotify's IPO from happening.

All three lawsuits focus on US Patent 6,232,539, which is described this way: