Re: CS3 multiple users
Technically, but I have seen my copy running on my laptop and at work at the same time. You are not supposed to use one license on 2 different machines at the same time, but it is mostly a trust thing because short of invading your privacy, Adobe really can't know they are running at the same time.
As far as not being able to load it on another machine, the license must have already been installed twice (at least Adobe thinks it has been.) If it hasn't been, then probably your only option is to call Adobe.