Piracy may sink an AI company's fair use defense

Here's the thing nobody tells you about fair use: it's supposed to be fair on both sides. The Copyright Alliance just spent a four-part series making a sharp point that authors watching the AI lawsuits should understand — if an AI company knowingly trained on pirated books, that alone might be enough to sink its fair use defense, no matter how the rest of the case goes.

The legal tool is called the unclean hands doctrine. It's old equity law, and the core idea is blunt: if you want a court to give you an equitable break, you'd better not have gotten there by cheating. The maxim is "he who comes into equity must come with clean hands." Traditionally this gets used by defendants against plaintiffs. But the Copyright Alliance's piece walks through how it flips: when a defendant — say, an AI company — raises an equitable defense like fair use, a plaintiff copyright owner can turn the same doctrine back around and use it to knock that defense out, if the defendant's misconduct connects directly to the matter at hand.

Why does this hinge on "equitable"? Because the Supreme Court has called fair use an "equitable rule of reason" in cases like Sony Corp. v. Universal City Studios and Google v. Oracle. The Alliance's piece is careful here — it flags that "equitable rule of reason" is a way of describing flexible, contextual judgment, not necessarily the same as saying fair use is fully governed by traditional equity jurisprudence, where unclean hands normally lives. That distinction is exactly where this fight will get argued out in court: is fair use equitable enough for unclean hands to apply to it directly?

No ruling has settled that question yet. This is a legal argument being built, not a decision that's landed. But if you're an author with work in any of the pending AI training suits, this is the argument to watch for in the briefs — because it changes the shape of the fight. Instead of just arguing "was this transformative enough," plaintiffs' lawyers can argue "you don't even get to make that argument, because you got the material by knowingly using pirated copies."

What to do this week: if you're part of, or watching, any AI copyright litigation involving your books, ask your Guild or counsel whether unclean hands has been raised or is being considered in your case. It won't change your check tomorrow. But if this doctrine gets traction, it could become the fastest way to knock out an AI company's fair use defense before the underlying training question is ever decided. Keep this one on your reading list, not your action list — yet.