DRM used

[Benihana]

Hello!

Apologies in advance if this is a "stupid" question, but besides Steam itself, is there any other 3rd party DRM used?

And I ask because while the Steam store is pretty reliable, they don't use a standard format for designating 3rd party DRM, and thus sometimes DRM does not get listed or is often missed. Plus what is listed is usually given by the game developer/publisher and not actually derived by the folks at Valve either.

Also, while many people don't care about 3rd party DRMs, some people do! Hence my asking.

Thanks!