With al the hulabaloo (sic?) about NPR and their hyperlink "permission slip" this week, I found this article from wired that sheds some light on their "logic" in this matter.
http://wired.com/news/business/0,1367,53355,00.html
It seems unlikely they would be able to enforce this policy. with the exception of the more egregious violations; what does the Cellar think?