Password Protect the
File
You can protect your document with a password. A
strong password includes letters and numbers. It should not be your
name.
Try it: Encrypt the Document
Go to Office ->Prepare.
Select
Encrypt Document.
Type a Password.
Security is a genuine concern. Hence, there is no
"Undo" if you forget the password. Neither is there a tool that will
let you remove the encryption.
Please write down your passwords!