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A libre licence is a license through which the author grants users the freedom to read, listen to, watch, or otherwise experience the resource; to learn from or with it; to copy, adapt and use it for any purpose; and to share derived works for the benefit of the community.
For a work to be considered "libre", it must either be in the public domain/CC0 or all of the essential freedoms must be granted by the licence. The essential freedoms are described in the libre knowledge definition and the free / Libre Cultural Works definition.
The following are examples of libre licenses:
- CC0 1.0 Universal (Public Domain Dedication)
- Creative Commons ShareAlike
- Creative Commons Attribution-ShareAlike
- Creative Commons Attribution
- GNU Free Documentation License
Mixing resources across licenses can be tricky.
For example, resources licensed under the Creative Commons Attribution license can be adapted/ extended/ enhanced or mixed into resources licensed as Creative Commons Attribution-ShareAlike, and the result may be released as "Attribution-ShareAlike" - but not the other way round.
Keeping track of attributions can be cumbersome, and derived works need to be licensed and attributed correctly (in accordance with the licenses of the mixed components). The (proposed) Libre Puro Licence below relaxes the attribution requirement and permits so-licensed resources to be mixed into various copyleft licences.
Draft Libre Puro License for Discussion
- Libre License Draft Based on the Creative Commons Approach
- Libre License Draft Based on FSF Approach