Libertine

I have a site which gets quite a few personal pictures submitted by surfers. Now, I thought I might do something cool with them - set up a contest where people can send in pictures, they get posted and the surfers can then vote for their favorites. The winner gets a cash prize every month.
However, this would be a nightmare from a legal standpoint. So, if I require people to send along a copy of their driver's license + a signed release, would that be enough to cover my ass?

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