Epic Games has released an updated End-User License Agreement (EULA) for Unreal Tournament 2004. The new agreement has updated cheating rules and Divx & OC3 license information. Included is word for those who make modifications that they are now free to make use of the assets from prior Unreal Games:

We just LOVE the idea of you using and distributing content from any prior Epic Games, Unreal franchise game in Unreal Tournament 2004 Mod. Therefore we grant you a license to use to use content any prior Epic Games Unreal franchise game in Unreal Tournament 2004 Mods. For the sake of clarity you will not gain any ownership whatsoever in any Epic content nor can you use any Epic content outside the scope of the rights granted here. Any attempt to do so will bring about the wrath of our attorneys.