In a recent article, the poetry critic of the New York Times complained that to do poetry criticism right, it’s often necessary to quote extensively from a poem. Indeed, in the case of a short poem, it might be helpful to readers to copy the whole thing. But, the critic said, this can’t be done because it might run afoul of copyright law.
It is true that copyright law prohibits the unauthorized copying of any substantial part of someone’s poem, song, or other work. What does “substantial” mean? Well, in one recent case, a federal court held that rap group N.W.A.’s unauthorized sample of a two-second guitar chord was infringing. The court’s holding was clear: “Get a license, or do not sample.”
Is this a good policy? From an economic perspective, no. Use of a small bit of someone else’s creative work to build a new creative work rarely harms the economic interests of the first copyright owner, because most “derivative” works do not directly compete with the original. In the case mentioned above, no one thought that N.W.A.’s rap song “100 Miles and Runnin’” would lure potential paying customers away from Funkadelic’s “Get Off Your Ass And Jam." (Note: neither song is safe for work.)