I read the links. They're all OEM and not retail, so valid for the initial system they're installed on only.
I'm not thinking of Windows, I thinking of what I was told in a support request response I got back from Kaspersky. As far as I'm aware, from what Kaspersky support said, an OEM installation is valid for the system installed on.... much the same as it is with Windows and most OEM software if I'm not mistaken.
If the OP has a retail copy or retail download, then he's fine and transferring it to another machine isn't an issue. If the OP's bought a 3 user OEM copy and has used only 1 of the 3 user activations, then that 1 user activation is tied to the system it was installed on. Moving to another mobo and using the key again effectively means 1 of the remaining 2 activations is then used up.
It might activate but it'll be 1 more of the 3 used up.