On the Review tab, in the Protect group, click Restrict Editing.
If you are an authenticated owner of the document, or if you know the password for removing document protection, do the following: Or you might have to be listed as an authenticated owner for the document. To remove all protection from a document, you might need to know the password that was applied to the document. Note: Encrypting the document prevents others from working on the document at the same time.
