In determining whether a use of a copyrighted work is infringement under the "fair use" doctrine,the least important factor is the effect of the use on the market for the work.

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The effect of the use on the market for the work is actually one of the most important factors in determining fair use. The four factors considered in determining fair use are: the purpose and character of the use, the nature of the copyrighted work, the amount and substantiality of the portion used in relation to the whole, and the effect of the use on the potential market for the work.

In Determining Whether a Use of a Copyrighted Work Is