# Perplexity AI

Encyclopaedia Britannica Sues OpenAI, Escalating a Global Copyright Clash Over AI Training Data

Encyclopaedia Britannica and Merriam‑Webster have sued OpenAI in New York, alleging unauthorized copying of nearly 100,000 reference entries to train ChatGPT and claiming the AI’s outputs divert traffic and misattribute sources. OpenAI invokes "fair use" and transformative use; the case joins a wave of copyright litigation that could reshape how generative models are trained, funded and regulated.