Sploder.com Terms of Service (funny?) line

Is last sentence a common idiomatic english expression used in formal license description contexts, or are they being a little bit over protective there? :) Sploder.com retains ownership of the game engine and all source code, SWF bytecode, graphics, artwork, ideas and concepts presented on and in conjunction with the site. Levels created by users remain the property of the user. By creating or submitting User Content you are granting Sploder.com unlimited license to host, cache, store, maintain, use, reproduce, publish, distribute, display, exhibit, broadcast, transmit, modify, create derivative works of, adapt, reformat, translate, and otherwise exploit your Submitted User Content in part or in total throughout the universe through any medium.