I am a newbie to VBA (been playing with Excel and Macro recorder for
years).

Trying to release a workbook for free, but don't want people making
money out of it, so need some sort of control.

I would like to have users of a spreadsheet have to enter their
Volume Serial Number as a password to allow access to the workbook.

I would only like to have the user to do it once on that machine and
then check each time it is opened that it is still on the same hard
drive it was copied to (i understand the issue that VSN can be
changed with a format)

Is there any code out there that can do this? or point me in the
right direction please

and if so, I think I would need a little explanantion on how to use
it.