https://www.vanityfair.com/hollywood/2017/08/hbo-hack-seven-times-larger-sony

HBO C.E.O. Richard Plepler told staff in a note Tuesday that the company does not believe its email system has been compromised, “but the forensic review is ongoing.” Per The Hollywood Reporter, the premium cabler is also working to block the leaked content from reaching viewers—including by sending a Digital Millennium Copyright Act take-down notice to Google, which is removing links to stolen material. HBO has used the DMCA to prevent the spread of copyrighted material for years, T.H.R. notes, “but the effort has not been nearly as aggressive as the network's post-hack offensive.”