Originally Posted by Korodny
Without a proper license, the code can only be used for "educational purposes, i.e. studying it.
Uhh, no? If someone puts something in the public domain, it's in the public domain. And in the US at least (and I think the UK?) copyright is a "use-it-or-lose-it" affair, so ambiguously copyrighted material can effectively be treated as if in the public domain until it's known that it isn't.