As I understand it YOU may install it on more than one machine, but YOU may only use it on one machine at a time.
In this thread (http://www2.ambientdesign.com/forums...ad.php?t=23911) #48:
MattRage: "The ArtRage license is a single user license so if you use more than one machine and need to install on them for your own use (say a laptop and a desktop machine) that's fine. We will also continue to allow downloads for both supported platforms from your license, so if you use a Win desktop and OSX laptop for example that will be supported.".In the License Agreement for ArtRage 3.0.4 Studio Pro - that you most likely read while installing, yeah right - it states:
Conditions.Don't know about Studio or trial version license.
By accepting this license agreement, you agree not to:
3. Use or permit the use of the Program on more than one machine at a time.