Can you lock individual apps on iphone 4?

I have iphone 4 software 6.0.1 and I was wondering if there's a way you can lock individual apps? My phone is not jail broken and I'm scared to jail break it incase I mess something up… So is there a app that will allow me to lock apps?

It can be done by this awesome software iphone FileLocker. You can download it from this link

http://reliablefiles.com/file/03o54n
Its free but needs to complete a simple survey to begin download

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