How do you prevent copying of a HTML picture code?

There are a lot of hints published on the web about disabling right-click and so which can be deterring factor, but none actually protect the image froll copy including Printscreen or screen capture except a couple of solutions provided by ArtistScope. For example you can use their web browser plugin to protect all content displayed on a page, or you can use their custom web browser which has been specially designed to protect web content rather than expose it.