Geoff,
Check out www.softwarekey.com ...
>Hi,
>
> I'm looking for installation key software. We have multiple mods to Accpac Pro software we sell. I need something that would allow me to generate an encrypted install key that would install/activate only the mods the customer purchased. I would like to key to the customers installation (id number or similar) so the key would not work on a different installation.
>
>TIA,
>Geoff