I was curious and tried his live demo URL. and I used OS X's built in screen capture while using Chrome. The screen capture worked, no special tricks needed. I didn't see any visual degradation between my screen shot and the original.
That also happened to me. But then I realized I set the browser to display everything in 110% by default. If you go back to 100% indeed you can't do a proper screenshot...
I was curious and tried his live demo URL. and I used OS X's built in screen capture while using Chrome. The screen capture worked, no special tricks needed. I didn't see any visual degradation between my screen shot and the original.
The long and short of it is his DRM did not work.