I don't know anything about your application, but if possible, I'd suggest de-coupling the application from the revenue source (i.e.: make downloading the appli

I don't know anything about your application, but if possible, I'd suggest de-coupling the application from the revenue source (i.e.: make downloading the application free, but extract revenue server-side via requiring accounts or another mechanism). This is especially important if your application has any back-end component (as pirating can go from just an inconvenience to something that costs you actual money if you're paying for network/server resources). Obviously, certain applications don't behave that way, in which case I don't really know what else you can do.