Libre implies freedom to access, read, listen to, watch, or otherwise experience the resource; to learn with, copy, perform, adapt and use it for any purpose; and to contribute and share enhancements or derived works.
Users of Libre Resources are free to
(0) use the work for any purpose
(1) study its mechanisms, to be able to modify and adapt it to their own needs
(2) make and distribute copies, in whole or in part
(3) enhance and/or extend the work and share the result similarly.
Freedoms 1 and 3 require free data formats and free software as defined by the Free Software Foundation