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James Grimmelmann's avatar

I think this is essentially right. When I teach the four-factor fair use test in copyright, I tell my students that the four statutory factors—in practice about a dozen subfactors—are a checklist of potentially relevant facts. If you go through them all, you will have identified everything in the case that bears on fair use. More advanced fair use analysis deals with which way each of them cuts, how strongly, and how they relate to each other.

Barton’s approach to learning decision trees is quite smart, and he does find that judges don’t stampede all the time. I teach my trademark students about his results on likelihood of confusion and then ask my students if they should cite his article in their briefs. They answer (I think correctly) that no, his findings help them evaluate a case and to organize their arguments, but the actual persuasion has to happen at the level of the test itself.

A final thought is that some multifactor tests are transitional stages between identifying the need for a test and actually nailing down which facts are relevant and how. It describes the universe of considerations but leaves to future cases the task of identifying which ones are determinative. But then, often, the courts get stuck. The actual test hiding in the factors is too complicated to formulate with confidence as a general rule, so they just continue to repeat the stock story about the multifactor test being the test.

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