I have a business spreadsheet. I want each new row of data to be made
unchangable (read-only) when the file is closed so entries will be
permanent when the spreadsheet is opened the next time. Changes need
to be able to be made during the session. If the information is
entered in rows 10 through 20 and columns A through M, I want only
these rows and columns to become read-only when the file is closed.
Anything outside of this range cannot be made to permanently change.
Most of these entries will reflect values from formulas. Can it be
done? Thank you for any help you might offer.

Michael