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Rh A use that shares the purpose of a copyrighted work, by contrast, is more likely to provide “the public with a substantial substitute for matter protected by the [copyright owner’s] interests in the original wor[k] or derivatives of [it],” id., at 207, which undermines the goal of copyright.

In a narrower sense, a use may be justified because copying is reasonably necessary to achieve the user’s new purpose. Parody, for example, “needs to mimic an original to make its point.” Campbell, 510 U. S., at 580–581. Similarly, other commentary or criticism that targets an original work may have compelling reason to “ ‘conjure up’ ” the original by borrowing from it. Id., at 588. An independent justification like this is particularly relevant to assessing fair use where an original work and copying use share the same or highly similar purposes, or where wide dissemination of a secondary work would otherwise run the risk of substitution for the original or licensed derivatives of it. See id., at 580, n. 14; Harper & Row, 471 U. S., at 557. Once again, the question of justification is one of degree. See Leval 1111 (“[I]t is not sufficient simply to conclude whether or not justification exists. The question remains how powerful, or persuasive, is the justification, because the court must weigh the strength of the secondary user’s justification against factors favoring the copyright owner”).

In sum, the first fair use factor considers whether the use of a copyrighted work has a further purpose or different character, which is a matter of degree, and the degree of