Div Lock/Hiding?

In safari, when viewing a page, you can grab an image to remove it or "copy" it off the page and onto your clipboard. However a site I'm working on has text as images. I don't want people to be able to drag and drop the image of the text off the page.

I've seen in other pages people hide the divs so that when you try to "drag" them off the page nothing happens.

Wondered if anyone knew the terminology for this & perhaps some code.

I Apologize if this has been discussed before, just not sure what to search.

I Apologize if this has been discussed before, just not sure what to search. Yes, this has been asked a number of times before. There's no way to protect something which is "served" to a user via their browser. A similar request can be seen at http://www.codingforums.com/showthread.php?p=182173#post182173