The main thing is that what you're doing, should be legally releasable. So if you have the rights to distribute the artwork in the game, then you should be able to submit it! As this is the first edition, we're also still learning how things work, so I think that the Ludum Dare guidelines are a pretty good basis, not just for jams, but for releasing games in general.
Hope that helps!
Cheers,
David Goemans