This is gonna sound absolutely crazy, so excuse my thickness but, will Kaspersky Internet Security "3 user" work on all PCs on the same network, or do they have to be seperate copies?
3 user is 3 copies of internet security with 1 license. you can install on anything its not tied to your network or anything.
I have the 3 user OEM Kaspersky Internet Security and have installed it on 3 separate computers at different places (networks) with no problems.