how to lock my powerpoint presentation

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1. How to Lock PowerPoint 2016 Presentation from Opening/Editing

   

2. How to Lock PowerPoint 2016 Presentation from Opening/Editing

   

3. How to lock a PowerPoint presentation with password protection

   

4. How to lock a PowerPoint presentation with password protection

   

5. How to Lock PowerPoint 2016 Presentation from Opening/Editing

   

6. How To Lock A Picture In Powerpoint