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A common example is Locking formula cells to prevent inadvertent erasure or modification of formulas. So, does this mean that Excel worksheet protection is absolutely pointless? Not at all! It makes sense to lock Excel sheets to avoid accidental changes in the sheet contents. In other words, if someone really wants to get access to a protected sheet, they will. The recent versions of Excel 20 use more sophisticated methods of sheet protection, but they are also vulnerable and can be unlocked without knowing a password. Anyone who has at least some basic knowledge of VBA can crack it in minutes (here's an example of the VBA code that easily cracks passwords in Excel 2010 and lower versions). In older versions (below Microsoft Excel 2010), it doesn't even matter how long and complex your password is. Even when you protect your Excel worksheet with a password, that password is very easy to break. Why? Because Microsoft Excel uses a very simple encryption algorithm for worksheet protection.

It's is not actually intended to prevent people from accessing data in a password-protected worksheet. Worksheet protection in Excel is not a security feature. What you need to know about Excel worksheet protection

Password protect an Excel file from opening.How to unprotect Excel sheet without password.

How to unlock Excel sheet with password.Excel worksheet protection - the basics.Luckily, Excel provides a quick and easy way to lock a sheet or password protect an entire workbook to prevent accidental or deliberate changes in their contents. When sharing your worksheets with other people or sending your Excel files outside of your organization, you may want to prevent other users from changing cells that shouldn't be changed, and also from moving or deleting important data in your worksheet or workbook. It also explains how to unlock Excel spreadsheet without password if you forgot or misplaced it. The tutorial shows how to protect Excel sheet with or without passwords.