Todays dumb question (sorry)

Does each virtual server on a Windows virtual server box need its own copy of Windows server, presumably data centre edition on rental at £25 a month, or is there a 'fiddle' (legal or otherwise?) to use just one copy 'spread' over as many VPS as you have on the box?

Reading The M$ site for the their own virtualisation software it seems to suggest you need one licence for the hardware box, plus one for each virtual - so even more. If thats right, how can seemingly legit hosts on here be offering Windows Vitual servers from £20 a month?

Sorry if the question and answer is really obvious - but it is monday morning.

Thanks in advance.

Steve

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