AFAIK this agreement exists, otherwise it would have been stopped in public by the MOS devs in the beginning. The more important question is whether OS4 guys WANT to license it. They are the only one who generate income with anything. OS3 does not sell anymore, AROS never sold. So for these they had to set up a bounty. Which they could but never did. So maybe ask them first why they did not. Then you will get t he answer from 95% of the Os4 guys that they abandon MUI because it is not OS4. For the same reason they favor ReAction. Then you can ask the same question you asked about the MOS team why not help MUI port to OS4 and others: why don’t they take the chance to spread ReAction instead to everywhere and make everyone use their GUI tool? So the bad feelings come because the OS4 devs and most of the OS4 users do not want to use MUI just because it is not OS4. Funnily many OS4 third party devs WANT to use MUI but have to deal with ancient versions because of the decision of the other two groups (OS4 team and users). So the point is that OS4 team does not want to use MUI officially but inofficially they need to support it because of so many 3rd party software that they prefer to not get a full MUI license but just a light license with all the work done a second time to catch up with something that has already been developed. And from the MOS team perspective: why support someone who broke your code rights repeatedly?
