What is creative commons

This information is taken from http://creativecommons.org/about/licenses/ 

The following describes each of the six main licenses offered when you choose to publish your work with a Creative Commons license. We have listed them starting with the most accommodating license type you can choose and ending with the most restrictive license type you can choose.

License Conditions

Creators choose a set of conditions they wish to apply to their work.

Attribution Attribution

You let others copy, distribute, display, and perform your copyrighted work - and derivative works based upon it - but only if they give credit the way you request.

Share Alike Share Alike

You allow others to distribute derivative works only under a license identical to the license that governs your work.

Noncommercial Noncommercial

You let others copy, distribute, display, and perform your work - and derivative works based upon it - but for noncommercial purposes only.

No Derivative Works No Derivative Works

You let others copy, distribute, display, and perform only verbatim copies of your work, not derivative works based upon it.

The Licenses

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Attribution

This license lets others distribute, remix, tweak, and build upon your work, even commercially, as long as they credit you for the original creation. This is the most accommodating of licenses offered, in terms of what others can do with your works licensed under Attribution.

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Attribution Share Alike

This license lets others remix, tweak, and build upon your work even for commercial reasons, as long as they credit you and license their new creations under the identical terms. This license is often compared to open source software licenses. All new works based on yours will carry the same license, so any derivatives will also allow commercial use.

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Attribution No Derivatives

This license allows for redistribution, commercial and non-commercial, as long as it is passed along unchanged and in whole, with credit to you.

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Attribution Non-Commercial

This license lets others remix, tweak, and build upon your work non-commercially, and although their new works must also acknowledge you and be non-commercial, they don’t have to license their derivative works on the same terms.

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Attribution Non-Commercial Share Alike

This license lets others remix, tweak, and build upon your work non-commercially, as long as they credit you and license their new creations under the identical terms. Others can download and redistribute your work just like the by-nc-nd license, but they can also translate, make remixes, and produce new stories based on your work. All new work based on yours will carry the same license, so any derivatives will also be non-commercial in nature.

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Attribution Non-Commercial No Derivatives

This license is the most restrictive of our six main licenses, allowing redistribution. This license is often called the “free advertising” license because it allows others to download your works and share them with others as long as they mention you and link back to you, but they can’t change them in any way or use them commercially.

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