App to hide/isolate videos and documents (such as PDFs) and view in-app?

[grahamf]

Hi, I switched to Android from Blackberry today, and I have it mostly set up except I'm still looking for an app to replace one I used before. The app I used was called PSP by runisoft and it would hide/encrypt files such as videos, pictures, documents, etc so that they can only be viewed and played in the app. I can't seem to find anything similar. There are many that only handle pictures and videos, but I need one that handles PDF documents too.

Any help would be appreciated.