Stefan said himself that the "anything you upload becomes property of CJ" was more of a safety precaution towards the company as a whole rather then the actual truth. Something we found out when Oinkness was hesitant about uploading his songs for Mythic since he didn't want CJ claiming the rights for it. At most you might see CJ using an image for another of their games, but not without trying to contact the original author first (if it's known who it is).
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