Those freedoms are: (0) the freedom to run the software as desired and for any purpose, (1) the freedom to study or change the software, (2) the freedom to redistribute copies of the software, and (3) the freedom to distribute modified copies of the software. The numbering of these four freedoms begins with zero because “Freedom 0” was added to the list after the other three, but it is considered more foundational than the others.

Dank