I have an Excel file with a big worksheet, frequently updated and submitted.
Quite a number of rows and columns are hidden in order to make the calculation details and raw data invisible to people receiving the file, and the sheet is password-protected.
However, a user still might read the hidden part by copying and pasting the content to another sheet, or by using a formula such as
where J9 is the hidden cell.
I know every wall has a way to break through, yet still, is there a way to protect the content of a hidden Excel cell from being (easily) read out by a "normal" user?