The site is using a webfont "protection" technique that was mentioned in a comment here a couple months ago, see https://news.ycombinator.com/item?id=20708371. It's a terrible idea.
Huh. I helped implement something similar on the site I work on, but for entirely user focused needs, without realising that it would be potentially problematic in certain renderers. Will have to check today, thanks for the heads up.
That "DRM" doesn't seem any more secure than ROT13... can we trace this terrible idea back to its source? I can't believe more than one person would come up with it by themselves.