A brief history lesson, that might help to make one or two things clearer. Its as accurate as I can manage, but don't sue me for slipups, right? Years ago there was Acorn Computers Ltd; they produced the BBC Micro, BBC Master etc. They then set about designing their own 32 bit cpu for their next generation of computers, and the ARM chip was born. ARM Limited was formed as a spin off and carries on administrating the architecture today. Acorn went on to use the ARM chip in various computers; its first OS was called Arthur, which later developed into RISC OS. Acorn used RISC OS both in desktop targetted machines and increasingly in a range of set top box like products and other embedded devices. The first bunch of ARM chips developed ran in what was called '26 bit mode' (don't worry about it), and the OS largely depended on some custom support chips. Eventually Acorn took the decision to drop out of the desktop market; when it did so, it granted a license to a new company (RISC OS Ltd) to the latest version (4) of its software. RISC OS Ltd carried on developing this OS and continue to do so today as part of their Select scheme. Shortly after granting the license, Acorn split into 2 sections; one became element 14, and the other was taken over by Pace. Pace carried on developing RISC OS in house, and produced a 32 bit hardware independent version of RISC OS. Later, AIUI, Pace stopped RISC OS development work, and shortly afterwards Castle announced that it was bringing desktop machines to market using the Pace version of RISC OS. Some sort of license deal had been made between Pace and Castle - my understanding is fuzzy here, I don't know if its a direct license or whether Castle have a license through another third party. It is this latest version of RISC OS that the accusation of use of GPL'd code has been made against. RISC OS Ltd, ARM Ltd, and Element-14 (AIUI now subsumed by Broadcom) are *not* implicated in any way - don't send them hate mail! riscos.org are *not* implicated in any way - thats a web site run by enthusiasts. Its not clear to me at which point the GPL'd code got introduced into the source tree; it could have been at any point after the RISC OS Ltd tree was forked from Acorns original source. Also, for those that don't know, Russell King was one of the prime instigators of ARM Linux, so together with Linus himself is probably one of the most significant opinions on this matter. FWIW: I'm an independent software contractor, who has worked under contract for Acorn, Pace, e-14, and RISC OS Ltd (though not on the portion of the code under discussion). I have no axe to grind here - this post is purely intended to sort out who the players in this particular drama are (and aren't!)

The sources used by RISCOS Ltd are not those used by Castle; the sources that RISCOS Ltd use were licensed a number of years ago from Acorn and do not include any components which are GPL, and acknowledge the components which they do use. Castle have, alledgedly, licensed their sources from Pace Microtechnology plc (the company who bought Acorn) and presumably added the PCI code from the Linux kernel themselves. I say presumably because I can't say one way or another whether the work was done by Pace or by Castle. Castle, as publishers of the product, are those who must be looked to for answers.