Hackers have claimed 1.5 terabytes of data were stolen.
The leak reportedly came from a pay-TV distribution partner Star India, whose logo appeared as a watermark in the leaked copy which had a "for internal viewing only" text. In previous years, screeners sent to the press were the method by which episode were leaked online, but HBO chose to do away with screeners for the seventh season. As reported by The Verge, the episode 4 leak has nothing to do with the hackers, and is instead the result of what appears to be insufficient security on the part of one of HBO's global distributors.
The Starks reunited and the Lannisters battled in episode 3 of Game of Thrones' seventh season.
Game of Thrones kicked off its season 7 madness July 16, drawing more than 10 million viewers for the premiere.
In a brief statement, HBO confirmed the breach saying, "HBO recently experienced a cyber incident, which resulted in the compromise of proprietary information".
Game Of Thrones is HBO's one of the most popular shows and in fact is the channel's crown jewel which is why it is quite damaging for the company both financially and for the company's public image. We immediately began investigating the incident and are working with law enforcement and outside cybersecurity firms. HBO has yet to issue an official response to this leak. Netflix had 10 episodes of its hit show "Orange is the New Black" released before airing after refusing to pay ransom charges to the hacker.
Some journalists received emails last Sunday night, written in somewhat halting English, announcing "the greatest leak of cyber space era is happening" and urging the media to spread the word.