Relax. For home use, you don't have to worry. It's perfectly acceptable to have more than one copy of an application. If you were to make free copies for your friends or use multiple copies for your office workers, that would not be OK. Some programs (Photoshop, for instance) are smart enough to see if there are multiple copies of the same application (and license) on a LAN but I don't think Bryce is one of these.