Usernames, passwords, etc. These documents are password protected themselves, but if they're anything like "protected" PDFs, they're pretty easy to crack.

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 ...

Learn how to unprotect Excel sheets or workbooks without a password using this simple step-by-step guide. No software required!

To remove protection from the spreadsheet, open it in Excel, click the "Review" tab and then click "Unprotect Sheet" in the Changes group. Type the password into the Password field and click "OK." ...

At the file level, you can password protect an Excel workbook in two ways: You can determine who can get in and who can save changes.