One Startup's Heretical Plan to Turn Open Source Code into Cash
wired.com
wired.com
Happy to answer any questions people have about the license. You can also check out a recent talk I gave about Fair Source at https://www.youtube.com/watch?v=y_x-9oJ4pv0.
Also what made you decide to go with 'number of users' as the determining factor for payment over a democratization model like with Unreal Engine?
Re: users, you can define "users" however you'd like, if you do so clearly on your own site where people can download your software and code. We're working on making the definition of "user" clearer; that's part of why Fair Source is only v0.9 right now. In some cases you'd want "users" to include end uesrs, and in some cases you wouldn't, so we need to figure out how to accommodate both cases.
Re: why "number of users" not Unreal Engine's model (paying $20/month to see source code) or the id Software/Quake model (open-source the previous version): Those work for libraries, but Fair Source is intended for end-user applications right now.
The reason I like this model is it encourages use in areas where you have multiple users but you aren't using the software to make any money like in schools.