How to Password Protect Pages, Keynote, & Numbers Documents on iPad & iPhone

The iWork suite of productivity apps include Pages, Numbers, and Keynote, and each of them allow users to password protect individual documents. In practice, this means that a document created within iWork in iOS, Mac OS X, or iCloud, can be safely locked with built-in encryption, and the document can not be opened or viewed without entering the defined password on any other device. For example, you can set a password to a Pages document on your iPad or iPhone, then open it again on the Mac from iCloud or the native Mac OS X app, and it will require a password, and of course this works the vice versa as well.
Here’s how to use this great feature on any platform offered by Apple, whether you’re using Pages, Numbers, or Keynote in iOS, iCloud, or on a Mac.

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