Mike MacSween wrote:
I have an Excel Workbook I want to distribute. I want to copy protect it. I
want to be able to email/post it to users, on first use they will be
prompted to enter a code, distributed with the workbook, they will then
connect to the web, and receive an 'unlock' key.

Probably best to write some custom code that can then output Excel files
(if you really want to be able to use Excel).