Game of Thrones hackers demand ransom

The most notable example was the 2014 hack of Sony, which led to executive turnover and a searchable archive of over 30,000 internal documents that eventually appeared on Wikileaks.

The confidential folder offers a screen shot of files that largely pertain to Game of Thrones and include castings, script summaries and marketing materials, including a detailed summary of the episode that is set to air August 13.

The threat was posted as alongside a 3.4 GB cache of other data the group says it stole from HBO.

Hackers who claim to have accessed HBO seem to be upping the ante.

"Our demand is clear and non-negotiable: We want XXXX dollars to stop leaking your data", the ransom note from Mr. Smith said in part, Wired reported.

The hackers asked for "our six-month salary in bitcoin", claiming they make anywhere from $12 million to $15 million a year from similarly blackmailing organizations they hack. Overall, the hackers claim to have stolen 1.5 terabytes of data. Given the severity of this breach, fans of TV shows like Game of Thrones should be alert as spoilers will be hitting the web well in advance of new episodes.

According to Channel24, the group sent out at ultimatum to HBO CEO Richard Plepler on Monday.

'HBO spends $12m for market research and $5m for [Game Of Thrones series seven] advertisements.

Now, as The Guardian reports, the latest dump of data from the hackers include personal details relating to the show's actors, plus scripts from upcoming episodes.

HBO released a statement on Monday indicating that the company does not believe its entire internal email system has been compromised. "So consider us another budget for your advertisements!"

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