The seventh season of Game of Thrones was illegally downloaded "more than a billion times".
Piracy tracking firm Muso says that its data suggests each episode was pirated around 140 million times, with the first episode the most popular so far.
That compares to 32 million legally viewed streams of each instalment.
HBO's internal servers were compromised, with scripts and the personal details of Game Of Thrones actors shared online.
Unbroadcast episodes of some of HBO's other shows, including Curb Your Enthusiasm and Insecure, were also leaked.
Hackers claimed to have stolen 1.5TB of data.
The majority of the pirate views from the seventh series of Game of Thrones came from streaming services (85%).
Torrents made up a relatively small percentage of the total (9%) followed by direct downloads (6%).
Talking to TorrentFreak, Muso's co-founder Andy Chatterley said the various leaks while the show was being broadcast on TV led to the high numbers.
"It's no secret that HBO has been plagued by security breaches throughout the latest season, which has seen some episodes leak before broadcast and added to unlicensed activity," he says.
"In addition to the scale of piracy when it comes to popular shows, these numbers demonstrate that unlicensed streaming can be a far more significant type of piracy than torrent downloads."
Muso says the data is based on estimates and doesn't include the Chinese market.
Total global downloads and streams by episode...
Episode one (Dragonstone): 187,427,575
Episode two (Stormborn): 123,901,209
Episode three (The Queen's Justice): 116,027,851
Episode four (The Spoils of War): 121,719,868
Episode five (Eastwatch): 151,569,560
Episode six (Beyond the Wall): 184,913,279
Episode seven (The Dragon and the Wolf) as of 3 September: 143,393,804
All episode bundles - Season 7: 834,522
Total (as of 3 September) = 1,029,787,668