None (All rights reserved)
As the copyright holder, you reserve, or hold for your own use, all the rights provided by copyright law on your work, such as distribution, performance, and creation of derivative works.

Creative Commons
Offering your work under a Creative Commons license does not mean giving up your copyright. It means offering some of your rights to any member of the public but only under certain conditions.

• Attribution
  You let others copy, distribute, display, and perform your copyrighted work but only if they give credit the way you request.
• Non-Commercial
  You let others copy, distribute, display, and perform your work — and derivative works based upon it — but for noncommercial purposes only.
• No Derivative Works
  You let others copy, distribute, display, and perform only verbatim copies of your work, not derivative works based upon it.
• Share Alike
  You allow others to distribute derivative works only under a license identical to the license that governs your work.

CC0
You waive the interest in your works and thereby place it as completely as possible in the public domain, so that others may freely build upon, enhance and reuse the works for any purposes without restriction under copyright.

Public Domain Mark
The Public Domain Mark is recommended for works that are free of known copyright around the world. These will typically be very old works. It is not recommended for use with works that are in the public domain in some jurisdictions if they also known to be restricted by copyright in others.