Since the first version of the standard was completed in May 2003 (22 years ago) and the most commonly used profile (the High profile) was completed in June 2004[citation needed] (21 years ago), some of the relevant patents are expired by now,[75] while others are still in force in jurisdictions around the world and one of the US patents in the MPEG LA H.264 pool (granted in 2016) lasts at least until November 2030.
Wikipedia covers it nicely:
https://en.wikipedia.org/wiki/Advanced_Video_Coding?wprov=sfla1