Fortunately, Excel provides built-in features that allow you to hide and password-protect your worksheets without requiring any programming skills. Password Protecting Excel Spreadsheet Data ...

With the Excel file open select File in the top-left corner of the screen, followed by Info. Select Protect Workbook, then choose Encrypt with Password.

Protecting a worksheet in Excel 2003 prevents others users from editing it. For example, if you have tracked and charted your business's sales on a sheet, you will want co-workers to access the ...

Safeguard your Excel worksheets from accidentally deleting formulas or data sets by locking important cells, while leaving the rest of the worksheet editable.

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.

You worked hard to put that Excel sheet together, now protect it from unintended damage.

Excel protection is lost once data is copied somewhere else. It really is that easy, so don’t make the mistake of thinking a protected sheet is secure.