BBC news now:
Virginia Giuffre agreed not to sue anyone connected to Jeffrey Epstein who could be described as a "potential defendant", a 2009 damages settlement against the sex offender shows.
The document, disclosed by a New York court, reveals the financier paid her $500,000 (£371,000) to end her claim.
Ms Giuffre is suing the Duke of York in a civil case for allegedly sexually assaulting her 20 years ago, when she was a teenager. He has consistently denied the claims.
The document was released ahead of a critical hearing on Tuesday in the civil case involving Prince Andrew - and the interpretation of the settlement will form a central plank of the argument between the two sides.
Although the settlement does not mention the prince by name, his lawyers say this 2009 deal means she cannot sue him - because she agreed to end all legal action against anyone connected to the offender who could be described as a "potential defendant".
A source in Prince Andrew's legal team said "Giuffre referred to 'royalty' in her 2009 claim [against Jeffrey Epstein] and that means Prince Andrew was covered by the deal.
He's probably not sweating a little less tonight.