"she determined that there is no such thing as a trademark in an artistic style, and that DSE does not have an enforceable trademark in the typeface used for the title, so the use of a Seussian typeface for Oh, the Places You’ll Boldly Go! is not trademark infringement."
Interesting case.
http://boothsweet.com/news/fair-use-of-dr-seuss-oh-the-places-youll-boldly-go/