You have no license in your repo.
So I know you don't want to publish it under an open-source license [1], but if you don't do it's essentially this 'license' which id described like this:
You retain all rights and do not permit distribution, reproduction, or derivative works. You may grant some rights in cases where you publish your source code to a site that requires accepting terms of service. For example, publishing code in a public repository on GitHub requires that you allow others to view and fork your code.
So just you know that this code can still be forked.
You have no license in your repo. So I know you don't want to publish it under an open-source license [1], but if you don't do it's essentially this 'license' which id described like this:
So just you know that this code can still be forked.
[1] http://www.golem.de/news/whispeer-soziales-netzwerk-mit-ende-zu-ende-verschluesselung-1508-115671-2.html (German)