For PC players, please review the following information regarding upcoming changes required for continued service use. ■ Notice on Upcoming Denuvo Removal Denuvo support for the PC version of Hi-Fi RUSH is scheduled to end at 00:00(KST) on January 16, 2026. Please note that even after Denuvo is removed, the game’s own anti-tampering features will remain active and will not affect normal gameplay. This adjustment is intended to provide a more stable and efficient service environment.
I assume its something that is against modding, and something to avoid unlocking DLCs for free. This is speculation on my part, I have no idea.