Looking to Pass
Jay snapped this photo of a car getting ready to pass me. The Ring is, as I understand, just like any other stretch of the Autobahn. It's your job to get out of the way of someone who wants to pass you, and if you get rear-ended, it's your fault for being in the way.
Passing is always on the left, even if you're going around a right-hander, where the racing line (the preferred place to be on the track) is on the right. If you see someone coming up behind you, you can either fight with them to keep them from passing, or you can turn on your right turn signal, indicating you are conceding the pass.
I really wouldn't recommend the former option unless you are comfortable having a high-powered racecar a foot off your rear bumper, floating in and out of your blind spot as you slam on the brakes to get through a corner at eighty miles an hour.