Extensy Populator for Jomsocial is licenced under GNU General Public License, version 2.
The source code is open. Some of the code come from Jomsocial.
You can freely use and redistribute the software, modified or not, under the same licence. Please keep in mind though, that copyright is a another issue. GPL licenced material is copyrighted and you should retain the copyright information.
You can use it on as many sites as you want for as long as you want. You are not required to be registered in our site for using it.