Read the entire article here.CC Zero is a new Creative Commons license to help content creators distribute their work on the Internet copyright-free. They can publish presentations, photographs, songs, web pages, screencast videos or any other form of content in the public domain via CC0.
When you apply a Creative Commons Zero (or "no rights reserved") license to your work, it means saying something like this to the world:
Here’s an article that I wrote for my blog but since I am distributing my content under Creative Commons Zero, feel free to copy this article or use it for any other purpose without asking for permission or attribution.
Almost all content (including blogs, images, etc.) will enter the public domain some day but with CC0, the author gets to push his work into the public domain during his lifetime.