I'm pretty sure what we're given is only a single-license.
That means it's only supposed to be loaded on to one machine. Multiple user licenses are more expensive, usually, but you can sometimes get each additional license for less than the cost of the software alone.
But, what do I know? Maybe it's a single-user license, and you can put it on as many machines as you want, as long as the same person is using it?
Personally, I'm of the opinion that if you pay for a product (in this case, I know we didn't) you should be able to do with it as you please.