imj: Castle own RISC OS and sell a licence to ROL to develop and sell RO4. If ROL breach the licence agreement, then Castle who issue the licence can revoke the licence at any time, as they have done. This is standard legal contract stuff. As to not revealing what parts of the licence agreement have been broken, they are probably keeping this secret so as not to interfer in any way (in their favour or ROL's) in any legal proceedings. I know very little about law but would assume, that at least until the case gets to court, they are not letting details out into the general public for good reason. I'm sure in good time we will know more details.