[ZeroGravitas]

They did something similar with the Opus audio codec:

https://datatracker.ietf.org/ipr/1520/

AV1 has some kind of patent-NATO thing where if you attack someone over AV1 patents they counter-attack with all their other patents, but does this count as an attack or would it only kick in if they sue someone?

> 1.3. Defensive Termination. If any Licensee, its Affiliates, or its agents initiates patent litigation or files, maintains, or voluntarily participates in a lawsuit against another entity or any person asserting that any Implementation infringes Necessary Claims, any patent licenses granted under this License directly to the Licensee are immediately terminated as of the date of the initiation of action unless 1) that suit was in response to a corresponding suit regarding an Implementation first brought against an initiating entity, or 2) that suit was brought to enforce the terms of this License (including intervention in a third-party action by a Licensee).