“Previously referred to as the "DOOM 3 Engine", id Tech 4 is our current technology licensing platform. Used by such titles as DOOM 3, QUAKE 4, Prey and Enemy Territory: QUAKE Wars, as well as the next Wolfenstein title, id Tech 4 revolutionized the use of real-time dynamic lighting, while the new MegaTexture code offers previously unprecedented terrain detail. Each license includes full source and tools for DOOM 3, QUAKE 4 and Enemy Territory: QUAKE Wars (beta).”