I guess it depends on what you call «use». You can read the code, for sure, probably even save it on your disk (it may depend on your jurisdiction though).

But, can you compile it ? I'm not sure… Better ask your lawyer. And what about running the compiled binary ? I don't think you're allowed to do that.

That's how copyleft licenses work. Base copyright law is more restrictive and possessing an unlicensed copy can be infringing in certain countries. This is why public domain is sometimes problematic.