Are there any apps to lock apps and folders containing apps for iPhone?

I have an iPhone 4 and I would like to know if there's any apps that can lock other apps, or hide them. Also if there are apps that can hide individual picture folders?

I use locktopus works great.search on google for the repository

No. If you jailbreak your iPhone, you can.
But, if you do, You're warranty voids automatically.
But, if you do want to, use www.evasi0n.com

I have an app called my apps lite. It password protects certain notes, pics, and Internet browsing. The full version might do more.

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