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Bookmark or Share- Restrict changes to files in Excel - Microsoft SupportNote: To further restrict reviewers from making changes to your document or spreadsheet, you can make the file read-only or you can password protect it. For more information, see Restrict changes to files and Make a document read-only .
- Protect a workbook - Microsoft SupportAdd a password to protect your entire workbook and control whether others can open or make changes to it. Protect your file by setting passwords for Open and Modify.
- Protection and security in Excel - Microsoft SupportExcel gives you the ability to protect your work, whether it’s to prevent someone from opening a workbook without a password, granting Read-Only access to a workbook, or even just protecting a worksheet so you don’t inadvertently delete any formulas.
- Video: Restrict changes to files - Microsoft SupportEncrypt documents with a password. Open the document that you want to password protect.
- Protect an Excel file - Microsoft SupportHow to protect an Excel file using a password to prevent unwanted access to your data.
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