At the heart of two big intellectual property disputes are three titans of pop culture: Black Eyed Peas, Andy Warhol, and Prince. Also: unicorn poop. Both cases could have huge implications when it comes to what constitutes “fair use” of another artist’s work. Sam talks with Slate’s Supreme Court reporter Mark Joseph Stern about why the Black Eyed Peas are going after a toy company’s dancing unicorn commercial, and why Andy Warhol’s silkscreen of a Prince photograph has made its way to the Supreme Court.

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