The Public Domain Mark is used to label a work that is already free of known copyright restrictions around the world, typically very old works.
Link to Public Domain Mark : http://creativecommons.org/publicdomain/mark/1.0/
You may see this other version of Public Domain (CC0) as well.
This is also a "no rights reserved" license, used by content creators to release their work into the public domain.
To use a CC BY work, you must:
You must provide attribution to the author of a work with a CC BY Creative Commons license. You are free to make changes and use the work as you want. You can use the image commercially or to make a profit, but you must give credit to the original creator.
Link to CC BY License: https://creativecommons.org/licenses/by/4.0/
To use a CC BY-NC work, you must:
You must provide attribution to the author of a work You are able to make changes or use the work as you want; however, you cannot use the image commercially or to make a profit.
Link to CC BY-NC License : https://creativecommons.org/licenses/by-nc/4.0/
To use a CC BY-SA work, you must:
You must provide attribution to the author of a work with a CC BY-SA Creative Commons license. You are free to make changes and use the work as you want. You can use the image commercially or to make a profit, but you must give credit to the original creator. You also must include the sharealike license that gives others permission to build upon your work.
Link to CC BY-SA License : https://creativecommons.org/licenses/by-sa/4.0/
To use a CC BY-NC-SA work, you must:
This is the most restrictive Creative Commons license. You must provide attribution to the author of a work You are not able to make changes or use the work as you want. You cannot use the image commercially or to make a profit.
Link to CC BY-NC-SA License : https://creativecommons.org/licenses/by-nc-sa/4.0/
To use a CC BY-ND work, you must:
You must provide attribution to the author of a work with a CC BY-ND Creative Commons license. You are not able to make changes or use the work as you want. You can use the image commercially or to make a profit, but you must give credit to the original creator and it must remain in its original form.
Link to CC BY-ND License : https://creativecommons.org/licenses/by-nd/4.0/
To use a CC BY-NC-ND work, you must:
This is the most restrictive Creative Commons license. You must provide attribution to the author of a work You are not able to make changes or use the work as you want. You cannot use the image commercially or to make a profit.
Link to CC BY-NC-ND License : https://creativecommons.org/licenses/by-nc-nd/4.0/
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