[greglockwood]

On the submission page, there is a large font link to the Submission Release form which answers any questions like that. (http://www.invincibilitee.com/SearchResults.asp?Cat=125) As long as it's just a submitted design (as in we have not accepted to use the design), you give us a 60 day window of not offering it to other sites or vendors. If we don't ask to use it within that 60 days, you can do whatever you'd like with it again. If we reach an agreement with you to use the design, you retain ownership of the design, but transfer exclusive rights to use it to us. So, basically, you can't let anyone else use it, but we can't take it and sell it either.

The Submission Release form explains it in a more "legalese" way. We use LegalZoom for our legal documents such as the Submission Release form.