How many license should I buy, for three wwebistes of the same owner

I need to create three websites, to the same customer.
All websites will be hosted on the same hosting plan/server.
Should I buy one licence for every single website? Or can I use the same licence, for all three websites.
As I say, the owner is the same, and the websites are not for sales.

1 website = 1 license

3 websites = 3 licenses

You need three licenses.

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Now is clear!