Wait... The phrase "Learn Enough" is trademarked? Wtf?
® stands for Registered Trademark
Absolutely anyone can create a term and put ™ after it (even if they never actually go through with the actual registration process).
> Is registration of my mark required?
> No. You can establish rights in a mark based on legitimate use of the mark.
http://www.uspto.gov/trademarks/basics/register.jsp
*: Some countries operate under a first-to-file system, and unregistered trademarks may be at risk even for US-based businesses that operate internationally.
(I am not a laywer and this is not legal advice.)