Prime Focus Technologies, a production vendor for Star’s TV channels and streaming service Hotstar, announced that four rogue employees were responsible for the leak of the fourth episode of Game of Thrones’s latest season. “Acting on the information and extensive evidence provided by PFT, the office of DCP Cyber Cell, Mumbai arrested 4 accused on August 14,” the company said in its announcement.

“It is important to note that this was not a system hack. It was an illegal breach of obligations by the concerned persons despite of [sic] PFT’s continual internal emphasis on protocols of content security and ethical practices,” the company said.

Prime Focus is a production vendor for TV channels and streaming services that processes video from studios and creates subtitles for them, in addition to other post-processing work. The company, which is listed on BSE and NSE in India, also provides analytics and metadata-related services, according to its website. It recently became a Netflix Preferred Vendor for subtitling and mastering video for online release.

This leak was unrelated to a wider breach of HBO’s servers earlier this month, after which individuals claiming to be responsible said they had several more episodes of Game of Thrones which they are currently threatening to leak. It’s also unrelated to a separate hack of HBO’s social media accounts, which has led to the leak of some Game of Thrones cast members’ contact information.