[userbinator]

There are protected processes, and protected processes light, but those are not used by most software (mainly anti-malware afaik.)

...and DRM.

[jchw]

Although that was definitely the intent, I actually don't know about specific things that use it. I'd love to hear what actually uses it. (I don't think Widevine l3 does, for example.)

[monocasa]

I seem to recollect that iTunes did, but maybe that was just on OSX.