The plaintiff says its representatives came to what they considered to be the "obvious and inescapable conclusion" that Dean's song copied the Withers track.
The latest filing draws heavily on Anthropic's internal records, obtained through discovery, to support claims the publishers first brought in October 2023.
Kimberly Marasco has asked a federal appeals court to overturn a decision that ended the second of two lawsuits she filed against the singer over her lyrics.