Have you watched a game of Association Football (or real football) lately? They digitally alter the ads on physical LED banners for different broadcast regions.
Yeah they started putting ads on the dasher boards a few years ago. There are also ads digitally inserted on the ice.
The tech is pretty cool. When they first started doing it, it would sometimes cut off players, but they seemed to get it settled down within a few months.
I know the /r/hockey sub was really upset about it when it was first implemented, and I was annoyed at first because of the glitches. But now, it's like...well, now I see these ads instead of those ads...what's the difference?