All the info is on their Licensing page: http://udk.com/licensing.html http://udk.com/licensing.html As long as you're not using a UDK app to generate revenue,

All the info is on their Licensing page: http://udk.com/licensing.html http://udk.com/licensing.html As long as you're not using a UDK app to generate revenue, it's free. And don't worry about the bit saying "[you'll need to buy a commercial license to] distribute an application you've created using UDK", it was cleared up by Epic shortly after: http://www.shacknews.com/laryn.x?id=21329409#itemanchor_21329409 http://www.shacknews.com/laryn.x?id=21329409#itemanchor_2132...