I think this might be worth some sort of mini-celebration. I never thought I'd live to see the day.

"the MP3 technology became patent-free in the United States on 16 April 2017 when U.S. Patent 6,009,399, ...administered by Technicolor, expired"

There are likely to be others outside of MPEG/MPEG-LA. Microsoft battled a patent troll over such patents a few years ago.