I think the nub of the article is that the artist had his artwork banned just for referring to the fact his designs were inspired by a mediaeval manuscript ie. 'The Book of Kells' because Trinity College have trademarked 'The Book of Kells' to use as a brand name on products they sell.
As it says in the article
>...So, are [Trinity College] actually saying that no one is even allowed to mention "The Book of Kells", for fear of violating their copyright? If so, that’s really going to fuck up a lot of History books!...
I take on board what you mean about the distinction between Copyright and Trademark, but I think it still serves to illustrate just how ridiculous the legal minefield around both issues has become.