Sony Music Publishing and Warner Chappell Sue Anthropic, Alleging Pirated Lyrics Were Used to Train Claude, With Exposure in the Billions
Sony Music Publishing and Warner Chappell Music sued Anthropic in California federal court on August 28, alleging it obtained copyrighted works through piracy to train Claude, and naming two co-founders as individual defendants. The complaint says works were taken from piracy archives including Library Genesis and Pirate Library Mirror, covering books containing lyrics and sheet music. Beyond training, it alleges redistribution via BitTorrent, scraping of licensed lyrics sites, digitizing physical songbooks, stripping copyright management information, and training Claude in ways that encouraged memorizing lyrics. The complaint identifies "tens of thousands" of compositions; at up to $150,000 per willfully infringed work, theoretical statutory exposure runs into the billions. Anthropic says it disagrees with the claims and will defend itself robustly.











