CC0 as close to releasing your content into the Public Domain as you can get, until content is no longer protected by Copyright Law.
Public Domain materials have no copyrights - but you still need to attribute or cite source and author as part of your obligation to allow others to re-search for and find the content you saw - to confirm or dispute your commentary or use.
Summary/Warning: In cases where works with mixed licenses are blended, each partial work and the appropriate license information must be clearly marked, so people do not mistake a Public Domain Work as being under Copyright or the Creative Commons License applied to the whole work.
Fox Valley Technical College • Library Services • 1825 N. Bluemound Drive • Room G113
Appleton, WI 54912-2277 • United States • (920) 735-5653
© 2019 Fox Valley Technical College All Rights Reserved.