Protect a document with a password - Microsoft Support
You can control access to a document by implementing a password for it. Passwords are case-sensitive and can be a maximum of 15 characters long. Create a strong password, ideally one that you can easily remember.
Require a password to open or modify a workbook
You can add a password to an Excel file to prevent unauthorized users from opening or modifying it.
Allow changes to parts of a protected document - Microsoft Support
Use Restrict Editing to protect parts that can or can't be changed, who can make changes, find areas you can edit, or unlock a protected document.
Remove a password from a document - Microsoft Support
Removing a password from a document is a simple process, but you have to know the original password. Open the document and enter its password. Go to File > Info > Protect Document > Encrypt with Password .
Manage access to your Word documents - Microsoft Support
Manage access to your Word documents You can control the extent to which others are able to view or modify your Word documents. Options vary according to where your documents are stored.
Embed or link to a file in Word - Microsoft Support
To insert a copy of your file into another, embed or link to it. Go to Insert > Object.
Make a document read only - Microsoft Support
In the box that opens, type a password you’ll be able to remember, and then type the password again to confirm it. The password is optional. But if you don’t add a password, anyone can select Stop Protection and edit the document.
Add or remove a digital signature for Microsoft 365 files
Add invisible digital signatures in Word, Excel, or PowerPoint. To protect the authenticity of a document's content, you can add an invisible digital signature. Signed documents have the Signatures button at the bottom of the document. On the File tab, select Info.
Restrict access to documents with Information Rights …
Using IRM in Microsoft 365, you can rights manage XML Paper Specification (.xps) files and the following Word file types: Documents .doc, .docx
Protect notes with a password in OneNote for Windows 10
Right-click the name of the notebook section that you want to protect, and then choose Password Protection > Add Password. In the Password Protection window, type the password you want into the Enter Password box.