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>At some point in the past Fox Applications could also run on UNIX and Apple Mac's - was there some kind of subsidy from those OS vendors?
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>Given that there has not been a unix version of Fox for almost 9 years - I would say that is irrelevant.
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>But...even if it were not irrelevent - at that time - there was not royalty free distribution. In fact, you needed the distribution kit - which cost something like $300. So in fact - the notion of subsidies in pre-VFP days is in fact - irrelevant.

Distribution kit is not a royalty, by definition. It is something you buy once, and don't charge each user for the same sum for each machine.