>>Is there not a licence that is open-source, but requires payment for commercial use?
>Ah, the honour system, or as it's also known, fuck you little guy.
I mean that's basically the WinZip model. The product is free to use for a limited time (that isn't actually limited) but commercial use requires license. Even if people cheat the system companies need to pay for their licenses. That might still work with an open source product.