Sony Music Publishing and Warner Chappell sue Anthropic over training data

Sources: The Verge, TechCrunch, discussion
Summary: The Verge and TechCrunch report that Sony Music Publishing and Warner Chappell filed a copyright suit against Anthropic in the US District Court for the Northern District of California, naming Dario Amodei and Benjamin Mann as defendants alongside the company. The Verge states the plaintiffs seek up to 150,000 dollars per work across tens of thousands of works, plus up to 25,000 dollars per instance of stripped copyright management information. The complaint alleges that Mann used BitTorrent to download over five million pirated books, that employees took at least two million more from Pirate Library Mirror, and that lyrics were scraped from MusixMatch and LyricFind.
Why it matters: Another training-data suit against a major model vendor adds to the licensing risk attached to commercially served models.