I think this type of model would be very difficult to enforce. You'd have to have lawyers and enforcement as part of your monetization strategy, and that would

I think this type of model would be very difficult to enforce. You'd have to have lawyers and enforcement as part of your monetization strategy, and that would just encourage people not to use it. If you're going to do something like a CSS framework; I'd say just make it open source. There is already so much prior work; it's something you should really only do if you're going to use it for something yourself and maybe contribute back in some way that others might find useful.