I know there are programs to hide programs from the prgrm menu.
But i've never seen a program that hides apps and progs, and if you reset your calc's Ram and Archive you can still have acces to the programs!
Maybe a new idea for projects...
I've tossed this idea around, but its only real use is for cheating on tests, and ticalc.org doesn't allow such files anyway.
Other semi-related things are KLogger and NoExec, the former logging keypresses and executed programs/applications, and the latter preventing execution of programs and applications.