BY means attribution
Every license in the current six-license Creative Commons suite includes BY. Reusers should credit the creator, identify the source and license, and indicate modifications in a reasonable manner.
SA, NC, and ND add conditions
SA applies reciprocal terms to shared adaptations. NC limits commercial use. ND does not authorize sharing adaptations. The elements appear in different combinations across the six licenses.
The version matters
A license name should include its version because legal terms have changed between releases. Follow the source record instead of assuming that every CC badge means version 4.0.
Put it into practice
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