You can assign a password to a presentation so that only those who know the password can open the presentation. Passwords can consist of almost any combination of numerals, capital or lowercase letters, and special keyboard characters.
A presentation can have only one password. If you change an existing password when you share a presentation with others, the new password replaces the original.
Important: There’s no way to recover your password if you forget it. Be sure to choose a password you won’t forget, or write the password down in a safe place.
If your iPad has Touch ID, the fingerprint recognition feature, you can use it to open your password-protected presentations with your fingerprint alone. For information on setting up Touch ID, see the user guide for your device.
Tap 
, tap Set Password, enter the requested information, then tap Done.
If you add a password after you share a presentation, be sure to notify participants.
Note: Adding a password to a presentation encrypts the file.
With the presentation open, do one of the following:
Change a password: Tap , then tap Change Password. Enter the required information, then tap Done.
A presentation can have only one password, so if you change the password when you share the presentation, that becomes the presentation’s only password.
Remove a password: Tap , tap Change Password, then turn off Require Password. Type the old password, then tap Done.
Tap the presentation, then place your finger on the Home button.
If you add a password to a presentation, or change an existing password, the password applies only to the version where the password was added or changed and to subsequent versions.
If the presentation is shared, to prevent others from restoring an unprotected version of the presentation or a version with an older password, stop sharing the presentation, add a unique password to it, then share the presentation again.