HBO continues to manage the fallout from this month's incredibly high-profile leak of the first four episodes of Game of Thrones season 5, sending out a flurry of take-down notices and sending letters to those who downloaded the files via BitTorrent.

Through its anti-piracy partner IP-Echelon, HBO has been contacting internet service providers (ISPs) to request they send out infringement notices to subscribers associated with the IP addresses of devices found to be downloading the leaked episodes, filesharing news blog Torrent Freak reports.

Pirate hunt: HBO is having ISPs send out notices to those who downloaded the leaked episodes.

Letters received by users around the world have been showing up online — like this one on Reddit from a user in Canada — and Torrent Freak claims to have seen several take-down notices after links to the episodes were posted publicly online.

The original leak appeared to come from a preview DVD sent to a group that had been approved by HBO to see the show early, and also resulted in the company having to take action against streaming app Periscope, where users were broadcasting the leaked footage. The four episodes were apparently downloaded from BitTorrent clients millions of times.