But I don't think in the first place it will be possible to de-blur sensitive documents as well as this. If you blur a region and than resize you loose that ex

But I don't think in the first place it will be possible to de-blur sensitive documents as well as this. If you blur a region and than resize you loose that extra bit information you'd normally need to be able to do a good de-blur afterwards. But this does makes me think, who knows terrorists could be using regular photo's, looking not important at all at first sight, to store messages. So you'd have to de-blur an out-of-focus zone to reveil the message.