Hi all!

I'm programming an Excel Add-in and we're wanting to control it's
distribution by forcing registration of the add-in.

Currently, the registration is stored inside the add-in itself and based
on the volume ID number of the C: drive of the machine it's installed
on. Whenever it gets copied to another computer, it sees the ID number
has changed and resets its registration back to "Free Trial" (there are
restrictions on various functions under trial mode).


Would it be better to keep track of registration using the system
registry since it's unique to every machine? If so, how would I be able
to get to it? Or is there a better way to keep track of it?

Thanks for your time and assistance.