
Users of pirated Windows will see reminders every few hours that they should purchase legitimate software and occasionally the software will turn your screen black. A Microsoft official described it this way:
"The user may reset the background to a wallpaper or another background color, but every 60 minutes, the desktop will be reset to a plain black color until the copy of Windows passes validation. In addition, a persistent notification will appear in the lower right corner of the desktop."
Luckily for Chinese pirates, the software is opt-in so if they do not want it they do not have to download it.