AresMUSH and the FS3 System are copyright 2007 by Wordsmyth Creations LLC ("the author") and are licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
In a nutshell, that means you can use, share and modify it as long as you give credit to the author and don't make money off it.
THERE IS NO WARRANTY FOR THIS SOFTWARE, EXPRESS OR IMPLIED. YOU ACCEPT IT AS-IS, AND AGREE THAT THE AUTHOR IS NOT RESPONSIBLE FOR ANY DEFECTS IN OPERATION, HARM TO THE GAME OR SERVER, OR ANY OTHER CLAIM, DAMAGES OR LIABILITY RESULTING FROM THE USE OF THE SOFTWARE.
As mentioned in the Creative Commons license, this license only grants you the right to use the software, and "may not give you all of the permissions necessary for your intended use." You are solely responsible for ensuring that how you use this software complies with all applicable laws and regulations, such as (but not limited to) copyright laws and privacy regulations such as GDPR and COPPA.
This license agreement consists of the only permissions to use this software, and use of this software is acceptance of its terms. Failing to adhere to the terms of the license agreement constitutes a violation of the author's copyright and will result in revocation of the license to use this software as well as any other penalties the author may pursue under law to protect their copyright.