There are six major licenses of the Creative Commons:
- Attribution (CC-BY)
- Attribution Share Alike (CC-BY-SA)
- Attribution No Derivatives (CC-BY-ND)
- Attribution Non-Commercial (CC-BY-NC)
- Attribution Non-Commercial Share Alike (CC-BY-NC-SA)
- Attribution Non-Commercial No Derivatives (CC-BY-NC-ND)
There are four major conditions of the Creative Commons: Attribution (BY), requiring attribution to the original author; Share Alike (SA), allowing derivative works under the same or a similar license (later or jurisdiction version); Non-Commercial (NC), requiring the work is not used for commercial purposes; and No Derivative Works (ND), allowing only the original work, without derivatives.
As of the current versions, all Creative Commons licenses allow the “core right” to redistribute a work for non-commercial purposes without modification. The NC and ND options will make a work non-free.
Additional options include the CC0 option, or “No Rights Reserved.” For software, Creative Commons endorses three free licenses created by other institutions: the BSD License, the CC GNU LGPL license, and the CC GNU GPL.