The origional script was pulled from here: https://gallery.technet.microsoft.com/SEC-AUDIT-8105a421
Since the Wayback Machine cannot make a copy of this page, I am taking a screenshot as I found it on 2018/05/11. https://imgur.com/AnWbf8Y
As listed on Microsoft's site, the license is MIT; however, after reversing the "secured" part of the script, the author is "claiming" the script is actually under GNU GPL Version 3 or later.
At this time, this repo currently is bound by both licenses. All changes will be noted as required in a new file called Sec-Audit-Modified.ps1.