MotherBoard identification

[Bartek Jarocki]

Hi, I'm programmer from Poland working alone on http://guardix.net 
project. It's software that helps keeping Cyber Cafe working 
properly including store management, barcode scanners suport,
cash registers etc. Software is a client-server solution, management
part works on Linux/Unix/*BSD and the 'plugin' that block computers
works on Windows and Linux/Unix/*BSD.

Problem:
I don't know how to make identification key of customer's host. For
example MotherBoard unique ID, is there is any posibility to get some
kind of host KEY? My software is almost 'ready to sell', but I have to
secure it somehow.
	I'll be grateful for any help,
			greetengs from Poland :)

-- 
+----------------------------------------------------+
| Bartlomiej Jarocki               filip at guardix.net |
| http://guardix.net   -   Linux Cyber Cafe Software |
+----------------------------------------------------+