This short video from Creative Commons Aotearoa New Zealand provides a brief overview of what Creative Commons (CC) is, and the different licenses that are available. Be aware that some resources mentioned are specific to New Zealand. The video is licensed under a CC-BY (attribution) license.
Creative Commons is a free licensing system that allows the author of a work to specify how that work can be used by others. Even though the author retains full copyright, the Creative Commons (CC) license gives others the legal permission to copy and use the work. Creative Commons licenses are not an alternative to copyright. The licenses apply on top of copyright, so you can modify your copyright terms to best suit your needs. Works held under a Creative Commons Licenses are indicated with a cc symbol. Additionally, CC works can have four other rights attached to the licenses that add or subtract certain permissions. These rights can be combined into six different Creative Commons Licenses.
See the Creative Commons FAQ Wikipedia page for more information:
Transcript for Creative Commons Licenses Graphic
Text taken from Open Education Resources at CCAC by Community College of Allegheny County Libraries, which is licensed under a Creative Commons Attribution 4.0 International License.
Public Domain License and Mark
There is one additional creative commons license- known as the CC0 license, it notifies people that the work is in the public domain.
"CC0 license enables scientists, educators, artists and other creators and owners of copyright- or database-protected content to waive those 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 or database law.
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 database protection, and the exclusive rights automatically granted to creators – the “no rights reserved” alternative to our licenses." -Text taken from Creative Commons website