It may be worthwhile to print serial numbers directly onto the keyboards themselves, and limit the reuse of the serial number to, say, 10 uses without intervention of Freedom Input.

Or add wireless activation code (just to BlackBerry platform) - that requires the user to submit their serial number along with other registration info. That way, you can use a database to determine if someone's been abusing a serial number (i.e. a manufacturer is cloning 1000 copies of the serial number). You wouldn't need to do it for other platforms, but the BlackBerry platform since that's the platform where you're trying to protect your drivers -- so only need to program for 1 device rather than 300 devices.

This would make things more convenient for everybody and last through many BlackBerry models, while discouraging competitors from using the same drivers with the same serial number. I realize that the keyboard is probably a modification of some kind of OEM design also also used by other manufacturers such as iGo/ThinkOutside -- the Shasta has nearly the same design (albiet no dual SPP/HID support.)

(P.S. The company I work for, bitHeads, also works with BlackBerry and other mobile devices. You could even hire consulting services through the company I work for!)