LabMathX requires a serial number and user name. If you pay the fee, then you will be provided with 3 licenses. This permits you to install LabMathX on 3 different Macs on which you are the Admin. Once installed, it is keyed to the hardware and copying will not produce functionality. Your user name and serial number are tied also. If you install LabMathX on a 4th Mac that has user differences, it won't work. Legitimate reasons exist for your doing this (buying a new Mac). If so, then just email us and we'll send a new serial number. We do not spy on your Mac and we do not require a network connection. LabMathX is copyrighted by Thomas L. Ferrell and Sky Coyote and may not be copied or distributed in any form without permission of these authors. No portion of the user interface may be duplicated in another program. BACK