Here is a tutorial to lock or hide only the formula cells in an Excel workbook. You can also lock formulas in all worksheets in a workbook.

Ever found yourself locked out of an Excel spreadsheet because you forgot the password or you have been given password protected Excel files from a ...

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A recommended approach to secure your most private documents — whether it’s a PDF, Word file, or Excel spreadsheet — is to lock them with a passcode. While this does help keep sensitive ...

A recommended approach to secure your most private documents — whether it's a PDF, Word file, or Excel spreadsheet — is to lock them with a passcode.

Using Microsoft Excel 2007, you can protect worksheets in order to keep other users from making changes. Unfortunately, this protection applies to everything on the worksheet, including groups.