Hektor Papis
Hektor Papis voted up Anonymous' answer

On school owned computers and school computer networks i expect they are completely legal.  If they somehow hacked your personal electronics and installed key loggers on yours without your knowledge that would be illegal but the school can install  any security software it deems necessary, including loggers to track students using school property in unauthorised … Read more

Hektor Papis
Hektor Papis voted up Rooster Cogburn's answer

Not really ! Read this about them. They can be used.

Are Keyloggers Legal? Or Illegal?

There is much heated debate about the utilization of keyloggers and with so many individuals using them to track cheating spouses as well as companies using them to monitor employees behaviors and production, those for an against them being legal all … Read more