Every law firm has to worry about data privacy. But when your clients are Madonna, Lizzo and Bruce Springsteen, the security of their personal information takes on a special edge.

New York-based Grubman Shire Meiselas & Sacks confirmed this week that it was hit by a ransomware attack, with the hackers reportedly demanding $21 million or they’ll expose 756 gigabytes’ worth of documents on the firm’s clients, which also include AC/DC, Lady Gaga and Robert De Niro. Late in the week reports said the demand had been doubled, and paired with a threat to release “dirty laundry” on President Donald Trump.