Best App to lock and hide pictures?

[WPCentral Question]

What is the best FREE App to lock and hide pictures?

 

[Rick_Air]

I use Photo Lock Pro. Does what I need, you can make separate directories within the app.
Just have to remember to delete the photo from the photo hub after importing as it just copies it.
Now go, hide your porn!

 

[geniovi]

use KYMS CALC