Attrib

How to view creative common(just how it is perceived subjectively, not a legal practitioner)

Creative common is a derivative of copyright, it cannot exist on its own.

BY - NC - SA

Each of these can be done by copyright holder, just that its not by default, its abstracted and the copyright owner have to explicitly specify the terms, with the cc tool allows the author/creator to do the same. For more indepth info check out the FAQ of cc.

Due attribution is given to all kind hearted souls who made an extra-ordinary affort to create such app/prg/device. The list can be had from the projects website that this place works with.

PS:- consult your legal practitioner for more