CC0 (aka Creative Commons zero) is a special license designed by the Creative Commons people which lets you put your stuff directly into the public domain. Without passing go, and without collecting £200. Once you sign up to CC0 for a piece of your work, you hand over all rights to it, and anyone can do what they like with it. It’s designed for anyone, not just artists, and already some scientists, educators and other groups have started using it to ensure their work goes to the world untethered. It’s fabulous, support it.
CC0 enables scientists, educators, artists and other creators and owners of copyright-protected content to waive copyright interests in their works and thereby place them 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. In contrast to CC’s licenses that allow copyright holders to choose from a range of permissions while retaining their copyright, CC0 empowers yet another choice altogether – the choice to opt out of copyright and the exclusive rights it automatically grants to creators – the “no rights reserved” alternative to our licenses.