Locking Voyager pictures?

I was just wondering if there is any way to lock photos taken.

Not so that they wont be erased but so no one can look at them.
On my old sprint phones i could type in a password and they couldnt be viewed without the code.

I looked through the owners manual and tried google but got no results

Thanks for any help at all!

-Mike

I dont no if there is or not, but I want to know if you can do it to.