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    "Attribution-NonCommercial 4.0 International"
    https://creativecommons.org/licenses/by-nc/4.0/

    You are free to:

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        copy and redistribute the material in any medium or format.
        - Adapt
        remix, transform, and build upon the material.

        The licensor cannot revoke these freedoms as long as you follow
        the license terms.

    Under the following terms:

        - Attribution
        You must give appropriate credit, provide a link to the license,
        and indicate if changes were made. You may do so in any reasonable
        manner, but not in any way that suggests the licensor endorses you
        or your use.

        - NonCommercial
        You may not use the material for commercial purposes.

        - No additional restrictions
        You may not apply legal terms or technological measures that
        legally restrict others from doing anything the license permits.