Topic: Dowload optional

I would like to see an option button, where I can activate / de-activate the download possibility on a folder. My idea behind this is the following: I would like to use CloudMe for photo sharing with friends, but I don't want that my friends can download these picutres and forward them to other social media platforms. Why? Because these photos could be photos of kids, party or my house and I only wand my friends to see them, but I don't want them to go to facebook, google or whatever.