Fonts are software, so you generally need to license it the same way you would license any other piece of software.
It's a lot of work, but part of the process in making fonts available for sale is to write the license agreements for different usages. You can see the different types of usages and the licenses that I have written for these usages on our site:
Post general font related questions (e.g. how to install, convert and use fonts) and requests (looking for fonts, designers etc.) here.
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