However, lots
of people do not understand how these licenses work, especially when it comes to mixing several works with different CC licenses attached to them.
This naturally
leads to creators in a constant struggle to ensure their work is being
correctly distributed. Often, after finding that their work has been (perhaps unintentionally) misused, they feel as if their work had been stolen. Lots of bad feelings back and forth, but fortunately it is not difficult to fix it.
How? Users must educate themselves that all CC licenses can be mastered by understanding only four major building blocks that go into all of these licenses. All CC licenses are just different combos of the four building blocks that I will discuss below. I will then describe the CC licenses most often used, from least restrictive to most. At the end, there is a matrix of what to do if you want to mix multiple works with different CC's attached to them.
How? Users must educate themselves that all CC licenses can be mastered by understanding only four major building blocks that go into all of these licenses. All CC licenses are just different combos of the four building blocks that I will discuss below. I will then describe the CC licenses most often used, from least restrictive to most. At the end, there is a matrix of what to do if you want to mix multiple works with different CC's attached to them.
A brief history of CC
Created in
December 2002 by the U.S. non-profit organization Creative Commons. We have seen
five redevelopments of the suite of licenses. The most current version of the
suite, 4.0, was released in November 2013. It is a set of generic licenses that
do not require adapting (porting) to the different laws of different countries.
This leads to the licenses being applicable to most jurisdictions around the
world.
The basic building blocks of all CC licenses are: ATTRIBUTION, SHAREALIKE, NONCOMMERCIAL AND NODERIVATIVES. Once you know these blocks, everything else will automatically fall into its place.
So, let's examine how the above basic building blocks play out in most popular combos, starting from the least restrictive to most.
There are six licenses that are most often used, plus CC0 (public domain, total freebie). All six of these grant “baseline rights”, including the right to distribute worldwide for non-commercial use as long as no modification is made.
All You Need to Know Are These Four Blocks
The Most Popular CC's, From Least Restrictive to Most
There are six licenses that are most often used, plus CC0 (public domain, total freebie). All six of these grant “baseline rights”, including the right to distribute worldwide for non-commercial use as long as no modification is made.

To be safe,
when crediting the creator, the distributor must include: the creator’s
identity (name or screen-name), the work’s title (if it has one), whether any
adaptions (derivatives) have been made, and what those adaptions are, the exact
CC license the work is under and any other copyright notices contained within
the work. These attribution rules apply to all the CC licenses.


More generally
speaking, if you are ever in doubt of what you can do under any of the CC
licenses, contact the creator for clarification. This will avoid a lot of
hassle and upset for you (which could result in legal action), and also for the
creator, who may not want their work shared in a certain way.



In addition to
these six licenses, CC does offer a method to release work to the public
domain, forfeiting as many legal rights as possible. This is called CC0 or CCZero. This form of public
domain equivalent license was released in 2009. CC0 is often used in
conjunction with the Public Domain Mark, also developed by CC and released in
2010. The Public Domain Mark is simply an indication of a work’s public domain
status. You may have seen the Public Domain Mark before; it looks like a
copyright symbol with a strike through it.
Any work with a CC0 designation has ‘No
Rights Reserved’. It
can never be assumed that any work carries this designation unless it is very,
very explicitly marked as CC0.

Select two works you wish to combine or remix. Find the license of the first work on the first row and the license on the first column. You can mix the two if there is a green smiley there. Use at least the most restrictive licensing of the two (use the license most to right or down state) for the new work. If there a red smiley, then you can not mix these works. This probably indicates that one of the two licenses may not used for commercial purposes, or one of the licenses does not allow for derivative works to be created.
Remix works with a NonCommercial building block
It is not possible to mix works where the first work is placed under a Creative Commons Attribution-Share Alike license and the second work is licensed under a Attribution-NonCommercial-ShareAlike license. The ShareAlike building block in first license requires that the newly created work is released under that license and can therefore be used commercially, the second license wants you to release the new work under a license that does not permit commercial use.
Remix work with a NoDerivative building block
It is not possible to use in a remix where NoDerivative is a building block in processing a work. All works released under this license may only be distributed in their original form. No cropping or lower resolution works can be made available. Parts of these works cannot be utilized to create other works.
Combining works

Select two works you wish to combine or remix. Find the license of the first work on the first row and the license on the first column. You can mix the two if there is a green smiley there. Use at least the most restrictive licensing of the two (use the license most to right or down state) for the new work. If there a red smiley, then you can not mix these works. This probably indicates that one of the two licenses may not used for commercial purposes, or one of the licenses does not allow for derivative works to be created.
Remix works with a NonCommercial building block
It is not possible to mix works where the first work is placed under a Creative Commons Attribution-Share Alike license and the second work is licensed under a Attribution-NonCommercial-ShareAlike license. The ShareAlike building block in first license requires that the newly created work is released under that license and can therefore be used commercially, the second license wants you to release the new work under a license that does not permit commercial use.
Remix work with a NoDerivative building block
It is not possible to use in a remix where NoDerivative is a building block in processing a work. All works released under this license may only be distributed in their original form. No cropping or lower resolution works can be made available. Parts of these works cannot be utilized to create other works.
Hopefully,
reading this article has given you a better understanding of the main Creative
Commons licenses. If you are ever in doubt of what you can and can’t do with
someone’s work, please seek legal advice or contact the creator directly for
clarification.