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Whereas a CC BY is the most liberal license, the CC BY-NC-ND is the most restrictive: this license only allows re-users to copy and distribute the material in any medium or format in unadapted form and for noncommercial purposes.

The main difference between the two licences is CC BY-SA requires that: If you remix, transform, or build upon the material, you must distribute your contributions under the same license as the original.

Attribution-ShareAlike: CC BY-SA This license lets others remix, tweak, and build upon your work even for commercial purposes, as long as they credit you and license their new creations under the identical terms. This license is often compared to “copyleft” free and open source software licenses.

Each CC license is made up of one or more of four license elements: Attribution (BY), Share Alike (SA), NonComercial (NC) and No Derivatives (ND).

The only difference between CC BY-SA and CC BY is the ShareAlike clause in section 3b of the legal code. Under the CC BY licence, anyone who adapts the work can redistribute a modified version under the terms of their choice. CC BY-SA, however, binds the adapter to the terms of the original licence.

CC BY is the most open license. It allows the user to redistribute, to create derivatives, such as a translation, and even use the publication for commercial activities, provided that appropriate credit is given to the author (BY) and that the user indicates whether the publication has been changed.

A Creative Commons NonCommercial license (CC NC, CC BY-NC or NC license) is a Creative Commons license which a copyright holder can apply to their media to give public permission for anyone to reuse that media only for noncommercial activities.