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Such as THIS
Why is it called "tamperproof"? >>
Because you can't take them out using readily available tools (ie flat/phillips head screwdrivers).
The PCs at work use a single tamper resistant screw to keep people from walking out with CPUs/memory.
They won't stop the truly determined thief (ie nothing a dremel can't solve), but they're enough of a deterrant to prevent a lot of damage/theft, & relatively cheap to use.
Viper GTS