I find the notion of Castle selling on the IPR (if the price was right) somewhat alarming [if that's an exact quote]. Big outfits (like MS) could easily buy the IPR with some "small change" and then "park it" - or for that matter increase license fees to such an extent that no-one in the current market could possibly afford it (e.g., 500K+ per year). And (unlike Castle) such a company *doesn't need* the good will of existing customers so could quite happily *sue* RISC OS Ltd., Ad6, Virtual Acorn or *anyone else* out of existance once the IPR was sold on.
As to the notion of the A9 being "competition" for the Iyonix, get real. It's almost completely non-expandable, slower and less capable. Also it is not that much cheaper than a base Iyonix Aria Cube. Castle may well be just exercizing their rights wrt that which they *do* own undesputedly (the 32bit SCL) - I also point out that at no point did John Ballance say they would *not* license it (sure if their prepared to sell the whole shebang if the price were right - licensing the 32bit SCL would not be such a problem (given the right price of course)).
If Ad6/ROL don't have the savvy to license that which they must in order to release their product then they really can't blame anyone else can they?