How to lock a worksheet with linked data?

I have an Excel worksheet with data linked from an Access database. I want to lock it so that no one can edit the Excel worksheet but yet the data will still update from Access. I can't figure out how to do both.

Thanks!

Would a password help? If those without a password could only open the file read only it would still update from Access, but they could not save any changes they make. That may not be what you want as they could still edit the read only version they have open and save a copy for themselves, but it would keep the original intact.