If you create a games or commercial applications using UDK for sale or distribution to an end-user or client, or if you are providing services in connection with a UDK based game or application, the per-seat option does not apply. Instead the license terms for this arrangement are US$99 up-front, and a 0% royalty on you or your company’s first US$50,000 in UDK related revenue from all your UDK based games or commercial applications, and a 25% royalty on UDK related revenue from all your UDK based games or commercial applications above US$50,000. UDK related revenue includes, but is not limited to, monies earned from: sales, services, training, advertisements, sponsorships, endorsements, memberships, subscription fees, in-game transactions, rentals and pay-to-play. You or your company will only need one commercial license to cover all the UDK based games or commercial applications you develop.