The license key covers updates on 3 sites for a year. (At some point in Q1 2019 I will will be expanding the licensing options to include enterprise licensing options.)
To give some color to the current licensing, it is really a single site license. In a typical development environment, you would have a development system, a staging site for testing, and a production site; hence the 3 site license so that you can keep it upgraded (and avoid the nag message) on all of those. But it’s flexible so you don’t have to do it that way. If you have three separate sites, that’s fine. For developers, it’s generally recommended that you attach the license to the end user (client), but that’s up to the individual business model of the developer.
Hope that clarifies. If not, if you have questions or need clarification, use the support site contact form – that gives me quicker turn around (I just do not have the available time to provide fast turn around on the wp.org forum).
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This reply was modified 5 years, 11 months ago by Chad Butler.