Security App to run or access folder via PortableApps?

I've searched through the directory and besides KeePass, i don't see any other security app that would "lock" access to folders or to run Protable Apps... i'm looking for something similar to U3 Launchpad program where you enable the securioty meauser and it "locks" both software and flash drive from being accessed without a password. Is this an app that exists already for Portable, or could it possibly go against everything PA was create for???

Any help or suggestions would be appreacited...