Hello! I can't add ® sign, because I will violate rules of this website in this way.
" Use of the ® symbol prior to registering your new logo may be considered illegal by your local government agency. Many of our clients are from the US - the United States body that governs such registrations explains clearly when and how you can use ®, TM and SM marks.
As an example for LogoTournament.com's many US clients, please see:
http://www.uspto.gov/faq/trademarks.jsp#_Toc275426682. "