If you want to limit who can open and view your Keynote presentation, you can protect it with a password. Anyone who receives the presentation from you needs to know the password in order to open it. If you’re sharing your presentation on iCloud, your collaborators also need the password.
You can also require a password to stop or exit the presentation while it’s playing, which is useful when the presentation is set to play automatically in a kiosk, for example.
In the Document pane of the Document inspector, select the “Require password to open” checkbox.
Type a password and a hint, then click Set Password.
To change or remove a password, choose File > Change Password (from the File menu at the top of your computer screen). Enter the requested information, then click Change Password or Remove Password.
When you require a password to exit a presentation, the password is applied to all presentations played on your computer, not just to this presentation.
With the presentation open, choose Keynote > Preferences (from the Keynote menu at the top of your computer screen).
Click Slideshow, then select the “Require password to exit slideshows” checkbox.
Type a password, then click Set Password.
This password applies only while the presentation plays on the Mac it was saved on. If you saved the presentation to a different Mac, you can reapply the password by following the steps above.
To remove this password, choose Keynote > Preferences, then deselect the “Require password to exit slideshows” checkbox.
Change a password: Choose File > Change Password (from the File menu at the top of your computer screen). Enter the requested information, then click Change Password.
Remove a password: Choose File > Change Password. Type the old password, then click Remove Password.
Note: Adding a password to a presentation doesn’t encrypt the file.