Control Copy (or, WPCC) (v4.98) is a content protection and copyright control suite, it can protect your content from copying it, or allow a limited copy with added text (such as copyright notice). Control Copy gives you the power to limit the visitors abilities to copy content (text, image, video or audio (html5)) from your site. Moreover, it gives you the ability to take control over the text copy action of visitors to your site (ctrl-c/cmd-c/right-click-copy).

Demo: http://codecanyon.net/item/wp-control-copy-protect-content-serve-copy/4289952