Trade Empires Uses Miles Sound System. Copyright 1991-2001 by RAD Game Tools, Inc. Copyright 2001 Frog City Software. All rights reserved. Frog City Software, Frog City, and the Frog City Software logo are trademarks and service marks of Frog City Software, Inc. All rights reserved. Take 2 Interactive Software and the Take 2 logo are trademarks of Take 2 Interactive Software. All rights reserved.