This fact wasn't explicitly stated anywhere that I can see on the product info, though it is hinted at in one place. I personally think that this should be made clearer, as they do state that it can be used on up to 5 devices as long as they are your devices and you are the one using it. Okay, if that is the case, then it won't pose a problem as I will just use it on my Macs. Even so, as a 35 year professional in printing, this is still the best value for the money and I am pretty impressed at the feature set for this price point. If word gets more vocal in publishing circles these apps should pretty much kill Adobe (their licensing is expensive and very intrusive to your experience as a DTPP).