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I too was caught out by this, in fact it was that script that lead me to Xoops. When I questioned them about it they denied it had anything to do with XOOPS and gave me the bums rush. I've lost more that $149 in my time, but it still sucks I was taken in.
They do in fact say, on one of their sites, that you may not remove their copyright nor distribute the script. If you do they will attempt to take legal action.
So, once bitten twice shy.