From the article:
When we went to our seats, the wait staff let us know that despite the fact that the previews were playing, we wouldn’t know until the movie actually started whether we could see the film or not. If it didn’t work, the screen would just turn black. Luckily, the film went through without a hitch.
Yes, I deal with KDMs weekly but I’m not for sure if this issue was KDM related or if it was certificate related. As for the service destroying themselves, I’ve never personally seen it happen, but I’ve been told by upper management that they’ve seen it happen twice. I don’t really have any way to verify the information but it wouldn’t surprise me and I don’t see why anyone would make that up unless they really don’t want people messing with it, but it seems like such an unlikely scenario.