> Cloanto [...] selling OS3.X before it supposedly obtained ownership of Amiga OS
> [...] violated Hyperion's legal right to be the sole entity to develop from OS3.1.
> Cloanto's license [...] did not entitle them to modify those files.

I'm not sure Cloanto was able to "develop from OS3.1" or modify program files without legal source code access. What they did to create 3.X was replacing whole files with newer post-Commodore files they obtained separate licenses for from the respective authors.