You're granting us an exclusive commercial license (not assigning your IP). We ask for that license so we can ensure that the other contributors who have worked on a project get paid.

We've decided to distribute the code with a modified-BSD license. We're open to discussing using different licenses but we've erred on the site of safety (for now). It'll be an easy change to make in the future when the risk/reward tradeoff of doing so is better known.

BTW, all our legal stuff is on on GitHub: https://github.com/assemblymade/legal It's a work in progress :)