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The CC-BY-NC-SA license is a type of public license used for sharing creative works online. CC stands for Creative Commons, a nonprofit organization that provides tools for freely sharing creative works under certain licenses.

CC-BY-NC-SA is one of the most popular and widely used Creative Commons licenses. CC-BY-NC-SA means:

- CC: This license is issued by Creative Commons.
- BY: Anyone using the work must give attribution (credit) to the original creator.
- NC: The work can only be used for non-commercial purposes. This means you cannot make money from the work.
- SA:The license has a "ShareAlike" requirement, meaning that any derivative works created from the original must use the same license.

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Thus, if someone uses a work under the CC-BY-NC-SA license, they can freely distribute the work as long as they give attribution to the original creator, ensure that the use of the work is non-commercial, and use the same license.