(There's no video for Keys Off 1.3.2 yet. Please contribute to MR and add a video now!)
Keys Off is a protection utility that locks the Mac from keyboard inputs, mouse clicks, menus, etc... and asks for a password to unlock it. Unlike a screensaver with a password, it still continues to display whatever is on screen normally. It just prevents input from users. The default password is the letter "a".
Also comes with an optional screensaver: BlackWatch v1.5.5
Keys-Off-1-3.2.sit (773.12 KiB / 791.68 KB)
Keys Off 1.3.2 installer (1999) / compressed w/ Stuffit
Architecture: 68K + PPC (FAT)
Mac OS 7.x - Mac OS 9.2.2
Emulating this? It should run fine under: SheepShaver