This page is intended to explain how Commons images (and other media) can be used outside Wikimedia projects without violating w:copyright.
Items in the w:public domain are exempt from copyright and thus cannot be licensed by anyone. This means they can be used in any way, for any purpose, with no restrictions. No one can legally claim to have copyright over a public domain item. It would be polite to cite the author and source, but it is not required.
If an image is multi-licensed, you can choose which license to comply with.
|License||Use on web||Use in print|
|GNU Free Documentation License (GFDL)||State on every html page that the image is used on, in readable type, "This image is licensed under the GNU Free Documentation License (GFDL)", with at least "GFDL" linking to either w:GFDL or a copy of the terms of the license on your local website.||...|
|Creative Commons Attribute (cc-by)||...||...|
|Creative Commons ShareAlike (cc-sa)||...||...|
|Creative Commons Attribute ShareAlike (cc-by-sa)||...||...|
|GNU General Public License (GPL)||...||...|
|GNU Lesser General Public License (GLPL)||...||...|
|Free Art License||...||...|