Thing is this the ROM image ROL sell has proudly emblazened on it the Pace logo (at least the splash screen shown on Drobe does and my RO4.01 rom does). That suggests that Pace had some sorts of rights to the OS (why else would ROL have included it?)
Also you may remember a while back ROL (this predates Iyonix) made available 32bit libraries. These also carried (c). Pace messages - but then (at some point) ROL refused to make them available anymore. To me that would *look* like Pace had made them available and then subsequently ceased doing so. ROL had no choice but to *accept it* and stop distributing them.
Later on Pace (according to THEIR website and a press release made by them and Castle) had sold their head license to Castle.
All of this suggests that in "rights" terms Pace had the lead. We *know* Pace sold their rights to Castle. That would suggest Castle has rights that are in some way "superior" to ROLs (just as Pace had done).
The real issue is how "ambiguous" the license terms were. I think you'd find that if Aaron and ROL had a real proof and no ambiguity about their claim this would have been to court years ago, they haven't which suggests that although they *may* have some rights to some portions of the OS that their rights are not as clear cut or as defensible as they might wish us to believe.
Let's suppose that the court finds against them? What then? You have the most advanced hardware implementation of RISC OS (Iyonix) gone, you'd have ROL unable to sell Select nor VA able to sell their product.
I think sa110 this is one piece of ambiguity that if you want *any part of the platform* to survive is better left ambiguous. I think you'd find taking this to court would be a sign that after all these years of shooting itself in the foot the RISC OS world had chosen to shoot itself in the head.