How can I stop iframe theft of my Kongregate game?

I entered a game in the Kong contest, but it's not the final version of the game... just the best I could do with the time available. I want to keep this crappy version from getting too widespread, so I site-locked the game (checking the Application.absoluteURL to make sure it is on Kongregate.com).

However, thieves are still swiping the game by putting it in an iframe. Normally you could easily stop iframe theft with a call like:

Application.ExternalEval("if (window != top) { document.location='http://kongregate.com'; }");

But Kongregate.com actually loads their game within an iframe all the time. So the game is ALWAYS in an iframe.

I figured I'd make sure the game is at least iframed by the right person. Kong's iframe is hosted on "a.kongregate.com" so I figured I'd check that. But the thieves who are taking the game are simply iframing Kongregate's iframe! Thus, it always looks like the right place. The iframe really is Kong's iframe...

How can I stop this iframe-based thievery? (And yes, in this case it's thievery, because I can see that they saw the sitelock message saying it was not to be distributed, and they went ahead and iframed it anyway to get around that.)