I would define it as hardware where the command set and interfaces to the hardware are documented and available to the general public.
This would mean that the OS running on a general PC may be covered, but a driver accessing proprietary hardware (for example, the NVIDIA driver) would not be covered, but the ATI driver would be (since ATI publishes the interface for their cards)That would also mean that it would be in the interest of hardware companies to reverse engineer & publish the specs of their competitor's hardware (or pay a 3rd party to do so), as that would grant them free access to the same technology, and in turn that would give open source developers proper specs to almost all hardware...? :)
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