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Copyfree (defined by The Copyfree Initiative) is a type of permissive copyright license that allows the freedoms to copy, use, modify, and distribute a work. Copyfree licenses are all free/libre/open licenses. However, some free/libre/open licenses include certain restrictions and requirements which make them non-Copyfree. For example, copyleft licensing generally requires that all derivative works be distributed under the terms of the same license.
Copyfree licenses include the Simplified BSD license, the Open Works license, and others, but not the GNU GPL or other copyleft licenses. While all copyfree licenses are permissive licenses, not all permissive licenses are copyfree. The Apache License 2.0 (as well as previous versions of this license) is an example of a non-copyfree permissive license. Another notable example is the Creative Commons Attribution 3.0 license, which is also incompliant with the Copyfree Standard Definition.
- "Copyfree Standard Definition". Copyfree Initiative. Retrieved 2011-09-27.
- "Copyfree: standard > rejected". Copyfree Initiative. Retrieved 2014-10-26.
Section 4, subsections 2 and 4 of the Apache License 2.0 violate point 3. Free Modification and Derivation of the Copyfree Standard Definition by specifying conditions (beyond licensing) that must apply to modifications.
- Anonymous. Copyfree Licenses. Copyfree. . URL:http://copyfree.org/licenses/. Accessed: 2013-04-29. (Archived by WebCite® at http://www.webcitation.org/6GFsj0kGe)