[css-d] Protecting background images

[Zog]

I would not have considered this a css topic except that it seems to 
have been implemented
in css. It does not seem to be possible to download the background 
images from this page http://csszengarden.com/?cssfile=/098/098.css 
without copying the urls from the css. All
background related context menu items are disabled in both Firefox and 
Ie  I would like
to know how this was implemented, unfortunately I haven't had much luck 
figuring it out.
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