I am very unfamiliar with Excel - using 2003.

I've been given a spreadsheet with multiple complicated formulas, and I need
to find a way to protect it from inadvertent changes. It's really a template
- I want to lock the formulas, etc., but I want people to be able to open it
up and paste in their data. It seems like this should be really easy, but the
Excel security overview (in help) and the other resources I've looked at
don't seem to address it - they just talk about protecting cells/data (which
I don't want - users need to paste in cell content) and/or formatting (also
don't care about).

How can I just protect the formulas from being changed, but still allow
users to paste in data to obtain calculated results?

TIA,
Jen