It all sounds suspiciously convenient that just when a free emulator and OS (ROOL RO 5) that all this starts up.
All stomping on ROOL or RO5 will do is put a near total end to any development of the OS (and given the hardware platform is effectively dead that IMHO would mark the true demise of the OS as well).
If this all goes "legal" all that it'll do is soak up the last bits of available cash to pay lawyers and put a spanner in the development works.
Besides ROL, if it had the documents at hand, could have challenged Castle long ago - they didn't. In fact it was Castle who challenged ROL and for a time production of ROL based products stopped - surely if the documents Aaron claims to have seen were so unambiguous the dispute with Castle would have lasted at most 10 minutes - ROL/Ad6 would have resumed production and Castle would probably have had to apologise.
The point is, I suspect, not as "clear cut" well not to the point of taking legal chances with. I suspect the current situation arises because Aaron or ROL feel that Castle having left the market would be more "relaxed" about extravagant claims being made by ROL and inclined to let these go unchallenged. And then there's the danger of a free RISC OS - nope that could not be tolerated could it ?
Whenever I ask myself why to I bother myself with RISC OS things like this make me more inclined to move my activities elsewhere. I mean what's the point?