Password protecting folders w/o encryption

Hey everyone. I was wondering if its possible to password protect folders without haveing to encrypt them. I have some (Ahem) "Movie files" that I want to block acsess to. Right now, all I do is just make the folder hidden and then make the folder I keep it in hide hidden folders. It works but its annoying. Many thanks for any help.

>>4

That solution fails for not being integrated into the shell, and having to decrypt all the file in one go upon opening, rather than the section currently been read/written to.