How to password protect a Pages file on iCloud

It took me awhile to figure out how to do this it so I thought I'd post it.

This isn't special for iCloud usage of course, it's for the Pages file in general which can be stored locally or on iCloud. It's very handy for accessing a sensitive doc from home, work or on the go with the phone.

Anyway, it's very easy. The feature is tucked away in the Inspector. See below.