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So is it possible to access an external CSS file and determine if there are any relative paths based on the required rule that if a line contains the string "url" it must match "url(http://"?
Would this be a complicated regex? Would it be difficult to setup some sort of Apache anti-404 script that disallows images to load from my site if the referrer is a cross-domain CSS file? If that were possible I could skip the PHP script altogether possibly. I think off-hand at least.