Edit : moved the question to Open Source SE : https://opensource.stackexchange.com/questions/5669/can-i-copy-a-project-from-codeplex-to-github
Asking about personal ethics from a personal perspective, this is not to become a commercial entity.
I have seen codeplex is disapearing, it looked like some projects are already abandoned there. specifically I saw this one that seems unchanged since 20013: https://xmlsorter.codeplex.com/
My question is can I put a copy on github, open t public with full acknowledgments of origin of the project? Or is there another way suggested to stay ethical and within the law? I don't know if I be actively maintain the project, just that I want to keep a copy for myself and others.