Cluebolt required! Not even in their most deranged moments would the Open Source Initialive approve the shared source licence suggested for RISC OS "Open".
"Rather, as third parties improve RISC OS, they are obliged by the licence to publish details of those improvements and they then become part of RISC OS, i.e. they are then owned by Castle - i.e. it increases their pool of intellectual property."
Do they assign their copyright to Castle? Otherwise, Castle merely have the right to privileged licensing terms under the dubious licence - they don't own those changes at all. Still, in other parts of Royston Vasey I'm sure everything that isn't shrinkwrapped or proprietary software is "PD", so Mr Beverley is clearly on the road to enlightenment, even if he has a way to go.