

If you want to insert a watermark on all slides, select the first parent master slide to start. Click the View tab on the ribbon, go to Slide Master. Open the PowerPoint Presentation that you want to add a watermark.

Using a watermark to indicate your individual logo or company logo. To protect a PowerPoint Presentation from being copied, you can add watermarks to copyright your slide. Add Watermark to Copyright A PowerPoint Presentation

To secure your PPT file, you can learn seven easy solutions here. How to protect a PowerPoint presentation from being copied? When you need to share the important files (includes a year-end summary, secret data sheet.) with others, you may think about such questions like how do I prevent PowerPoint presentations from being copied.
