That thought crossed my mind too, but if you really want to get technical...
The "NS" logo does not show a copyright symbol on or around it, so it is not legally reprehensible to charge someone with copyright infringement if they were to copy it.
Also, if it were copyrighted, there would need to be an international copyright lawsuit (because it would be involving both Canada and the US) which Newschoolers certainly doesn't have the spare cash lying around for. AND WHY WOULD DOUG GET PISSED OFF ABOUT A BUNCH OF $5 BANDANNAS PROMOTING HIS WEBSITE?
Yeah, it would probably be a reasonable idea to message Doug and ask for permission, but I'm sure he'd be fine with it.