Creative Commons is a copyright movement that supports the building of a public domain by providing an alternative to the automatic all rights reserved copyright to some rights reserved. 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 that the work not be used for commercial purposes; and No Derivative Works (ND), allowing only an original work without derivatives. and Libor Coufal.