Crypto fags would say it's not secure because "We developed our own encryption instead of using a standard" so they've bound to have fucked something up.
Here's a quote:
http://everything2.com/index.pl?node_id=1152118
"Until recently EMF's algorithm hadn't been broken. That has changed. Someone doing work for the FBI has cracked our algorithm."
So, learn some crypto, learn some programming, release a soft, make a minor name for yourself.
If you're talking about hidden, but not encrypted, folders it's easy. Just use a linux boot disk.