The code currently is not released under any license. Is this done on purpose?
It would be great if it were released under an open source license like GPL or MIT. A good reference for figuring out what you want is this article http://www.codinghorror.com/blog/2007/04/pick-a-license-any-license.html.
BSD license, close #4
Absolutely not on purpose. Just not thinking. BSD 2-clause license, short and sweet.