I hide my personal pictures and videos from other by just changing the "File type" extensions. For example any video .mp4 I change it to. Jpg or something. And it will become corrupt..... well I wanted to know whether it is safe to do so????????????????
It should be safe to change the extension as long as you know the original extension when you want to view the file again.
Apps like the Pictures and File Manager can not open unknown file types. eg: if you change a extension from .jpg to .abc no apps can open the file unless you view the file from an app that doesn't care about extension like a hex editor (if you can find one for the BB)
if you want to hide a folder just use an app the creates a hidden folder. the only problem to that is anyone can read the files if they take the sd card or when they view the device files from a connected computer.
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