Security
Sets password options for the current document.
Open file read-only
Select to allow this document to be opened in read-only mode only.
This file sharing option protects the document against accidental changes. It is still possible to edit a copy of the document and save that copy with the same name as the original.
Record changes
Select to enable recording changes. This is the same as Edit - Track Changes - Record.
To protect the recording state with a password, click Protect and enter a password. Other users of this document can apply their changes, but they cannot disable change recording without knowing the password.
Protect / Unprotect
Protects the change recording state with a password. If change recording is protected for the current document, the button is named Unprotect. Click Unprotect and type the correct password to disable the protection.