.© 2005, Valve Corporation. Day of Defeat, the Day of Defeat logo, Valve, the Valve logo and Half-Life are trademarks or registered trademarks of Valve Corporation. Uses Miles Sound System. Copyright © 1991-2001 by RAD Game Tools, Inc. Miles 3D Realistic Sound Experience (RSX) Software Copyright © 1997-2001 by Intel Corporation and RAD Game Tools, Inc. MPEG Layer-3 playback supplied with the Miles Sound System from RAD Game Tools, Inc. MPEG Layer-3 audio compression technology licensed by Fraunhofer IIS and THOMSON multimedia.