PEEK is an iPhone app that allows it's user to share photos that self‐destruct in 30seconds, and are protected from full screen capture and copying.
The encrypted pictures are viewed in what Peek calls 'torchmode'.
This means the entire picture is never fully visible, the recipient literally only gets a peek through the 'mask'.
To play, simply capture or select a photo from your phone's albums, send the encrypted pic via MMS or email, and Peek will unlock the photo for the recipient for 30seconds so they can have a look.
The great thing about PEEK as an idea is that it obviously exists in response to an existing behaviour. Whatever one may think about the sensibleness of that behaviour, it is clearly a something that is going on. It is difficult if not impossible to enforce any legal measures that prevent private communications from being misused and making it onto dubious Tumblrs and so on, the next best thing is to make it safer.
Because images are never uploaded to PEEK's server they stay between the sender and recipient.
PEEK makes it somewhat safer to play, for those who arre of the inclination, and keeps things private.
Have a peek at PEEK.