FWIW, Via Licensing listed this patent as standards-essential to several MPEG codecs (AVC/H.264, HEVC/H.265, VVC/H.266), and it's also listed for VC-1 (a SMPTE standard).
I specifically remember that my dad brought from work crappy projector and I watched Harry Potter and the Order of Phoenix that was RMVB encoded camera rip from cinema. RMVB was all the rage on my 128kbps internet.