iPhone Core Data Encryption - encrypt your sqlite databse

in IOS4 Apple introduced a new feature NSFileProtectionComplete to encrypt the filesystem.

I found very useful article. 

https://nickharris.wordpress.com/2010/07/14/core-data-and-enterprise-iphone-applications-protecting-your-data/

Remember that we can apply this only with Device not with simulator.

And on device you should enable the passcode security under Settings -> General

If you have iTunes login, see the apple video about security

session 209 securing application data in category : Core OS 

https://developer.apple.com/videos/wwdc/2010/

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We need to prompt a message to the user if file system is not protected, So
How to know the device is password protected ? or How to know the filesystem(database) is encrypted.?