CC 协议全称为：知识共享许可协议（Creative Commons license）。Creative Commons官网为：https://creativecommons.org/，为非营利组织。这里做个这方面的记录。
以下是 CC 协议的四个元素：
- BY (Attribution, 署名): Credit must be given to the creator.
- SA (ShareAlike, 相同方式共享): Adaptations must be shared under the same terms.
- NC (NonCommercial, 非商业性使用): Only noncommercial uses of the work are permitted.
- ND (NoDerivatives, 禁止演绎): No derivatives or adaptations of the work are permitted.
常见的 CC 协议：
- CC BY: This license allows reusers to distribute, remix, adapt, and build upon the material in any medium or format, so long as attribution is given to the creator. The license allows for commercial use.
- CC BY-SA: This license allows reusers to distribute, remix, adapt, and build upon the material in any medium or format, so long as attribution is given to the creator. The license allows for commercial use. If you remix, adapt, or build upon the material, you must license the modified material under identical terms.
- CC BY-NC: This license allows reusers to distribute, remix, adapt, and build upon the material in any medium or format for noncommercial purposes only, and only so long as attribution is given to the creator.
- CC BY-NC-SA: This license allows reusers to distribute, remix, adapt, and build upon the material in any medium or format for noncommercial purposes only, and only so long as attribution is given to the creator. If you remix, adapt, or build upon the material, you must license the modified material under identical terms.
- CC BY-ND: This license allows reusers to copy and distribute the material in any medium or format in unadapted form only, and only so long as attribution is given to the creator. The license allows for commercial use.
- CC BY-NC-ND: This license allows reusers to copy and distribute the material in any medium or format in unadapted form only, for noncommercial purposes only, and only so long as attribution is given to the creator.
- CC0 (aka CC Zero) is a public dedication tool, which allows creators to give up their copyright and put their works into the worldwide public domain. CC0 allows reusers to distribute, remix, adapt, and build upon the material in any medium or format, with no conditions.
一些使用 CC 协议的例子：
- 维基百科使用的是 CC BY-SA 3.0 协议。
- Physical Review X、Physical Review Research 使用的是CC BY 4.0协议。
- arXiv 在用户上传文章时会让用户自行选择某个 CC 协议或其他协议。
- ORCID 官网使用的是CC0协议。
补充说明：本站文章可能会不定期修改，为了全网显示的始终都是最新版本，目前文章不支持转载。而以上列出的所有 CC 协议都是支持转载的，因此当前本站不使用 CC 协议。本站的协议为单独的声明，在每篇文章底部显示。
参考资料：
[1] https://creativecommons.org/about/cclicenses/
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