Have you ever received a presentation that doesn’t allow you to make any changes? That could be a password-protected presentation. Alternatively, it could have been Marked as Final. Fortunately, Mark as Final is more of an administrative tool than a security tool — it’s purpose is to make others aware that the author of the presentation doesn’t want others editing this work. First of all you need to make sure that a presentation indeed has a Mark as Final attribute applied. To do that, check the lower left area of the Status Bar at the bottom of the PowerPoint Interface. You should see the Mark as Final icon.