Is there any possible way i can lock my notes on my iphone?

I don't mean lock, lock it so no one can get in. I mean like lock it so a won't accidentally delete the note(these are really important notes )

I think this is no way to lock them. But you can use some 3rd party app to extract them to computer.
Such as http://datarecoveryforiphone.com/ios-data-recovery.html.

If it works, can you give me the best answer?