I'm not talking of the proprietary license, but of the exchange between buyer and seller. I've never talked to an Oracle salesperson, but I doubt that they'd sa

I'm not talking of the proprietary license, but of the exchange between buyer and seller. I've never talked to an Oracle salesperson, but I doubt that they'd say that the software isn't guaranteed to run and/or be useful. The same goes for FOSS when a consulting company is involved: they say that the software will work; my point is that that's the most likely way in which a large enterprise can run FOSS. There are other ways, of course: the decision can come from a high enough manager (or even from the CEO or CTO) who's willing to take the risk, but, indeed, they are taking a risk.