DRM, short for digital rights management, tends to be a contentious issue. On one hand, it has the noble intent of preventing piracy, although “cracks” tend to find a way around it. On the other hand, it serves as an inconvenience for gamers who attain a game by legal means. The case with Metal Gear Rising: Revengeance is an example of what can go wrong. Actually, it’s practically a worst case scenario.
For now, gamers who own the title on Mac are not able to play the game because of issues with DRM. A recent Reddit post has substantial evidence to back up the theory that the reason for the inability to play is that the DRM, which as to contact the company that made the game, can’t. Why? Transgaming, the developer that handled the port, no longer exists. It had to close down. Its last January 2017 patch did not remove DRM before the closure.
For now, this means that there is nobody around to make a patch for the game or to remove the DRM. It isn’t clear if anybody will step up to remedy the issue, either. Transgaming, perhaps, should have handled the issue before they went out of business but there wasn’t a financial incentive. Konami has also not made a statement on the issue. It seems, though, that someone should do something as a gesture of good will.