I want some pics to have copyprotection, so then users CANT download them, how can i do that?
Don't put them on the internet.
Seriously though, you have to set up some sort of directory protection, like a .htaccess file that allows people to see the thumbnails but stops them from accessing the full size pictures unless they have a specific password you give them. You can find excellent .htaccess tutorials on the web.
There isn't anything Coppermine can do for that.
I want people to saw the full size picture, but i dont want them to downlod them
Impossible. There are recent posts that talk about this exact same issue. If I can see the picture, I can save it.
Pictures are stored in temp internet files anyway so the only sure way to stop people from getting at the fullsize pictures is by not posting them at all.