Each page should be marked with a copyright. This can be selected via the "Licensing" meta-tag in the collapsible "Page setting" panel on each page (see below).
Selecting the appropriate license requires more discussion about the nature of the license.
Creative Commons Licensing
The Creative Commons licenses are the most ubiquitous licensing in OER and grant "baseline rights", such as the right to distribute the copyrighted work worldwide for non-commercial purposes, and without modification. The details of each of these licenses depend on the version, and comprises a selection out of four conditions shown below.
Other Licensing Options
Other licensing is possible including the GNU General Public License (GNU GPL) the GNU Free Documentation License (GNU FPL). These are less common licensing in OER.
Cannot ARBITRARILY Mix and Match Content from Different Licensing
Rights in an adaptation can be expressed by a CC license that is compatible with the status or licensing of the original work or works on which the adaptation is based.
Avoid adding any content into the Libretexts that has a ND license on it. These do not play well with the community remixing aspect of the LibreTexts project. There are a few texts with this annoying license on the platform, but not many.