FxSound and DFX are purchased as a personal license so you can install FxSound and DFX on all the computers that you use, such as your desktop and your laptop.
However if someone else wants to install FxSound on their computer then they would need to purchase their own license.
Every additional purchase of FxSound can be had at a 50% discount, however!
Just enter your email into this form after you've made your first purchase to get 50% off on any additional licenses! http://www.fxsound.com/webapps/upgrade