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By default PowerPoint files could be opened by anyone with Microsoft Office installed on his computer. But if your PowerPoint presentation contains sensitive or private data, you may want to restrict the number of people who can open the presentation. For some other situations, like a teacher, he may send a copy of his PowerPoint material to students but doesn’t want others to make changes, so it’s better that the PowerPoint file be set as “Read Only”. How to solve these problems? You could add a password to protect your PowerPoint presentation!
1. Select the “File” tab and choose “Save As”.
2. In the pop up “Save As” dialog box, click the “Tools” drop down menu and choose “General Options”.
3. In the “General Options” dialog box, you can add two kinds of passwords: password to open or password to modify.
4. Click“OK” to apply the changes.
When you open the encrypted PowerPoint presentation again, you will be asked to enter the password.
Besides add password, in PowerPoint 2010 you could also save PowerPoint as PDF or save PowerPoint as WMV video format to protect your presentation from being modified. Another benefit of converting PowerPoint to video is that you could freely watching PPT on Smartphones or tablets, or uploading to websites like YouTube.