Prime Focus Technologies, the India-based tech group, Wednesday sought to distance itself from the recent leak of part of hit TV series “Game of Thrones.”

On Aug. 4, links to view Episode 4 of Season 7 of “Game of Thrones” bearing a Star India watermark appeared online three days before the episode’s scheduled air date. In a statement, PFT described this as an “illegal breach of obligations by current and former employees.” Four people were arrested on Monday in Mumbai in connection with the leak.

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

Indian news media named the four as Abhishek Ghadiyal, Bhaskar Joshi, and Alok Sharma, all current employees of PFT, and Mohammed Suhail, a former staffer.

PFT is the technology arm of Prime Focus, one of the world’s largest post-production and VFX providers. Prime Focus has grown through acquisition of Double Negative and Reliance MediaWorks.

The statement explained the firm’s commitment to security and outlined its cooperation with authorities.

“PFT manages 1.5 million hours of content for some of the world’s biggest broadcasters and studios globally. As a technology partner, PFT invests in content integrity and security, makes significant investments to ensure content protection,” it said.

After the leak, “PFT immediately initiated forensic investigations to determine the cause. Based on a multifaceted investigation including extensive logs of our system, a complaint was filed on August 6, 2017, and supplementary information was provided on multiple occasions,” which culminated in a report being filed with Mumbai police on Aug. 9, PFT said.