adrianl: "I was thinking of products that are purely software."
Well, it's possible to sell GPL-licensed code, of course, as well as to provide paid support and services for such code whether obtained for free or otherwise. And there are real people out there who seem to have made such business models work. Meanwhile...
druck: "ROL now has the ideal opportunity to licence some already written code and get out a release to Select customers, however I suspect the reluctance they have shown in the past to paying licence fees will mean that miss this boat too."
The problem with this scheme is that companies like RISC OS Ltd. will see that they're automatically lower in the hierarchy than Castle, and since they'll want to keep the end product closed source, they may well avoid developing anything that passes revenues upwards in that hierarchy. Even if they want to sell stuff whilst giving away the source, they still have to pay Castle something.