Remove Read-only protection from a presentation
The Mark as Final command makes a presentation read-only, but it is not a security feature. You or anyone who receives an electronic copy of a presentation marked as final can reverse the Mark as Final status and edit the presentation.
To determine whether a presentation is read-only, look for the Mark as Final icon in the status bar at the lower-left side of the PowerPoint window, as shown below. When you unmark a presentation, the icon disappears from the status bar.
Open the presentation that is marked as final, and then click the File tab.
In the left pane, click Info.
Click Protect Presentation, and then click Mark as Final to undo Mark as Final status.