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Summary
Creative Commons License Buttons: BY

The Creative Commons buttons that describe a key term of our license, such as BY, NC, ND, SA, Sampling, Sampling Plus and Noncommercial Sampling Plus may only be used in the context of pointing to a Creative Commons license on the Creative Commons server that includes that license term or to otherwise describe the Creative Commons license, that includes that license term and that applies to a particular work.

See: http://creativecommons.org/policies