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You can lock a presentation in PowerPoint 2016 for Mac so that others can read it, but not change it.
Lock a presentation to make it read-only
Caution: If your presentation is shared, anyone who has Write privileges can clear the locked status. For stronger protection, require a password to save changes. (In your presentation, click File > Passwords.)
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Open the Finder and select the presentation you want to protect.
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Ctrl+click or right-click the presentation file, and then click Get Info.
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Under General, select the Locked check box.
Unlock a presentation
Note: You must be the owner of the file, or have Write privileges, to clear the locked status of a presentation.
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Open the Finder and select the presentation you want to protect.
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Ctrl+click or right-click the presentation file, and then click Get Info.
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Under General, clear the Locked check box.
