Data Protection, Keychain and Core Data's Sqlite files

I'd appreciate that someone could make it clear some questions I have regarding Data Protection feature:

1. Is needed/recommended to enable Data Protection to encrypt and protect the SQLite files managed by Core Data? If so, what should I do to encrypt and protect such files?

2. I followed a tutorial for using Keychain and it said that complete level of Data Protection had to be enabled for the App ID in the Apple Member Center, so that I did. However, it said nothing about also enabling Data Protection in the Xcode's project, so I didn't. It seems that I can access Keychain in my iOS app without problem, but this looks weird... should I also enable Data Protection in the target's settings?

Thanks so much