The Creative Commons Licensing

CC BY-NC-SA: This license allows reusers to distribute, remix, adapt, and build upon the material in any medium or format for non-commercial purposes only, and only so long as attribution is given to the creator. If you remix, adapt, or build upon the material, you must license the modified material under identical terms. 

CC BY-NC-SA includes the following elements:
BY: Credit must be given to the creator
NC: Only noncommercial uses of the work are permitted
SA: Adaptations must be shared under the same terms

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