Ken, download the free crypto plugin written by Dave McKee - http://www.protolight.com/ Look for the external function listed below. When called, it returns the volume serial number, that is assigned to the hard drive of a PC or a Mac, when the disk is formatted. With some type of activation method using this number, you can prevent you solutions from being stolen.
External ("crypt-VSN", parameter )
[use "" as the parameter]
Regards,
Mike Stephenson