Someone leaked footage of the upcoming game Grand Theft Auto (GTA) 6 this month, and the game’s publisher badly wants to know who. It’s after a range of data about members of three Discord servers going back to June 1 this year in a bid to nail the perpetrator.

Take-Two Interactive, the publisher behind the GTA series, hit Microsoft and Discord with a subpoena on August 20. It’s demanding IP addresses, phone numbers, linked Google and Xbox accounts, and OneDrive contents of certain server members. It’s also after their MachineGuid values and Microsoft account device IDs, which identify individual Windows installations and devices that access Microsoft services, respectively.

An account calling itself CyberLeek started publishing game footage on August 17 and also revealed some of the game’s map. It claims ideological motives, publishing a manifesto with three commandments. In brief, it wants publishers to stop publishing digital-only versions of games, stop making players pay extra to unlock single-player content shipped with the base game, and guarantee to preserve single-player modes forever.

CyberLeek warned game publishers:

“Behave, or be the next target.”