That is a good, common way, yes. The general idea is to break something in
the Close macro that you fix in the Open macro -unless time is expired or it
isn't paid for or whatever. Breaking things like that is creative and fun to
program.

Note that these things aren't extremely safe, skilled excel users, like the
ones you find here, will have few problems breaking into your file. But for
the target audience "users" it's sufficient.

HTH. Best wishes Harald


"Paul B" skrev i melding
...
Ditchy, have a look here for one way

http://www.danielklann.com/excel/for...be_enabled.htm