“OERS are teaching, learning, and research resources that reside in the public domain or have been released under an open license that permits their free use and re-purposing by others. Open educational resources include full courses, course materials, modules, textbooks, streaming videos, tests, software, and any other tools, materials, or techniques used to support access to knowledge.
Attribution CC BY
This license allows users to distribute, remix, adapt, and build upon the material in any medium or format, so long as attribution is given to the creator. The license allows for commercial use.
CC BY includes the following elements:
BY 
– Credit must be given to the creator
Attribution-ShareAlike CC BY-SA
This license allows users to distribute, remix, adapt, and build upon the material in any medium or format, so long as attribution is given to the creator. The license allows for commercial use. If you remix, adapt, or build upon the material, you must license the modified material under identical terms. This is the license used by Wikipedia
CC BY-SA includes the following elements:
BY – Credit must be given to the creator
SA 
– Adaptations must be shared under the same terms
Attribution-NonCommercial CC BY-NC
This license lets users remix, distribute, and build upon your work for non-commercial purposes, and only so long as attribution is given to the creator. Users don’t have to license their derivative works on the same terms.
It includes the following elements:
BY – Credit must be given to the creator
NC 
– Only noncommercial uses of the work are permitted