This is not unprecedented, TCC relicensed part of its code by being approved by all authors: https://repo.or.cz/tinycc.git/blob/3d963aebcd533da278f086a3e559d24

This is not unprecedented, TCC relicensed part of its code by being approved by all authors: https://repo.or.cz/tinycc.git/blob/3d963aebcd533da278f086a3e559d24b961e8c31:/RELICENSING https://repo.or.cz/tinycc.git/blob/3d963aebcd533da278f086a3e... The interesting part is that the original author is against it but some people claims it could be a rewrite and not a derivative work. I don't know the legal basis of everything but it's definitly not morally correct toward the original author.