With a Creative Commons license, you keep your copyright but allow others to copy and distribute your work provided they give you credit — and only on the conditions you specify.
All works are automatically protected by copyright at the time of creation. A copyright registration is not required, but is advised if you ever wish to bring a lawsuit for infringement of a U.S. work. Copyright does not protect names, titles, slogans, or short phrases. In some cases these may be protected as trademarks. For more information consult the U.S. Patent & Trademark Office.