Patent Jackpot
I seem to recall seeing material that described this as a patent that somehow escaped the ATSC3.0 patent pool. This isn't the first time this has happened, its actually a patent holder's dream that they find their technology is essential to some widely standardized technology without it being part of the patent pool so they can charge whatever they feel like to anyone who unwittingly uses it. (Remember RAMBUS?) Its a widely reviled practice and remember that one of the major TV manufacturers had literally pulled its products off the market rather than negotiate with these trolls.
(Fortunately TV in all its forms is now effectively obsolete. ATSC3.0 seems to be nothing more than a variation on distributing IPTV over WiFi; there's probably some patents floating around minor aspects of the technology -- there's always bottom feeders claiming to invent the obvious and the USPTO tends to be only too happy to oblige them -- but hopefully these trolls can be left high and dry.)