Thanks, Ev.
That clause would mean I can't submit anything I've written. All of my manuscripts have been seen by third parties, crit partners. I know they really just don't want work that's out with industry professionals who might offer to buy it out from under them, but that's not what they say.
I'm also not thrilled that they say "Sponsor may also share this information with select marketing partners, who may use it to contact you with information and offers they believe will be of interest to you. " It makes the contest feel like a way to get my data for sale.