Simoultainous editing with InDesign document and Drop box

Simultaneous editing with InDesign document while the original is online. Is there a way that two people can work on a document, but NOT be able to if the other person has the document open?

As example:

I made a book file with multiple documents. There are two primary designers who will work on these. They are up on a Dropbox folder where we use both the application and the browser application. The browser app allows you to see when someone edited anything as it's a history. I know when you open a document, InDesign creates the lock file where the document is stored. Is there a way to ensure that the file is locked and cannot be opened by another person, or anyone for that matter?

Basically ensure that two people can work through a book and on different documents within, and not interfere with editing, or cause conflicted copies.