A group of hackers posted a fresh cache of stolen HBO files online Monday, and demanded a multimillion-dollar ransom from the network to prevent the release of entire television series and other sensitive proprietary files.

HBO, which had previously acknowledged the theft of “proprietary information,” said it’s continuing to investigate and is working with police and cybersecurity experts.

In a swaggering five-minute video from “Mr. Smith” to HBO CEO Richard Plepler included in the dump, the hackers used white text scrolling on a black background to deliver an ultimatum. In short: Pay up within three days or see the group, which claims to have stolen 1.5 terabytes of HBO shows and confidential corporate data, upload entire series and sensitive proprietary files.

Specifically, the hackers demanded “our 6-month salary in bitcoin,” and claimed they earn $12 million to $15 million a year from blackmailing organizations whose networks they have penetrated. They said they would only deal directly with “Richard” and only send one “letter” detailing how to pay.