DOOM Retro is Copyright © 2013–2016 by Brad Harding. All rights reserved. Made in Sydney, Australia. DOOM Retro is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. DOOM Retro is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. DOOM is a registered trademark of id Software LLC, a ZeniMax Media company, in the US and/or other countries, and is used without permission. All other trademarks are the property of their respective holders. DOOM Retro is in no way affiliated with nor endorsed by id Software.