https://www.polygon.com/2017/8/30/16226024/sonic-mania-pc-issues-offline-play-denuvo-drm >Sonic Mania is now on Steam after a two-week delay, but those who waited find it comes with a catch: The PC version comes with Denuvo, an unpopular anti-piracy software that surprised players with its inclusion. >Complaints about Denuvo cropped up on Sonic Mania’s Steam community forum shortly after launch. Sega failed to note on the game’s store page that Mania came with the digital rights management service built in, so when buyers found it included in the game, they felt duped.