You should not have to purchase a license :-
Amibench OS (v46) (
https://wiki.amiga.org/index.php/AmiBench) is a newly developed OS by Amigakit, the system doesn't have an official deal with Clonato/Amiga Inc and so is powered by a heavily modified Aros OS and Aros Kickstart Replacement Rom. AROS Research Operating System (AROS – pronounced "AR-OS") is a free and open-source multi media centric implementation of the AmigaOS 3.1 APIs.
