1. CKEditor comes under which licenses?
  2. Who can use Open Source CKEditor?
  3. What are the Open Source requirements when using CKEditor?
  4. Can I modify the source code?
  5. Can I include CKEditor in a commercial environment?
  6. Can I remove the “About” button?
  7. Do I have to include additional terms or notices in order to use the Open Source license?
  8. Where are the original CKEditor copyright notices located?
  9. Are there limits to how many individuals can use CKEditor?
  10. Are there commercial distributions of CKEditor?

  1. CKEditor comes under which licenses?

    CKEditor is distributed under three copyleft Open Source license options: GPL, LGPL and MPL.

    For those who want more flexibility and legal peace of mind, CKSource offers CKEditor Premium, which is a commercial distribution of CKEditor. It includes special license terms and dedicated support.

  2. Who can use Open Source CKEditor?

    Anybody, as long as you abide by the CKEditor Open Source License Terms.

  3. What are the Open Source requirements when using CKEditor?

    Generally speaking, you must keep the copyright notices in each file intact and not delete the LICENSE.html file located in the CKEditor installation folder.

    For more information on Open Source licenses go to http://opensource.org/

  4. Can I modify the source code?

    Yes, but any kind of modification or enhancement you bring to the editor code must be released under the same Open Source license terms.

    For more information regarding modifications go to http://opensource.org/

  5. Can I include CKEditor in a commercial environment?

    Yes. You may use the editor in commercial products and websites as long as you abide by the CKEditor Open Source License Terms.

  6. Can I remove the “About” button?

    Yes, the About button can be removed from the toolbar. It cannot, in any way, be replaced with a custom About button, nor the contents of the About dialog be modified.

  7. Do I have to include additional terms or notices in order to use the Open Source license?

    If you include CKEditor inside an application with its own copyright, the terms must clearly identify which parts of the code are not bound by your copyright. Otherwise, nothing needs to be mentioned.

    In any case, it is forbidden to alter or remove any of the original copyright notices and LICENSE.md file.

  8. Where are the original CKEditor copyright notices located?

    Every file includes a copyright notice. There is also a LICENSE.md file located in the CKEditor installation folder. Please leave them untouched

  9. Are there limits to how many individuals can use CKEditor?

    No.

  10. Are there commercial distributions of CKEditor?

    Yes, CKSource offers a dedicated commercial distribution called CKEditor Premium.

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