Not a lawyer either, but I don't think giving it away for free would protect you at all. Just look at Napster. And if you charge for the viewing, well, that's like charging for the beer at the Frat party, instead of charging for rock (I like Man E's idea above). Just make sure it's not an endangered rock covered by some Protection Agency, or taxed by the Govmt... Speaking of that, don't forget to claim the proceeds/loss on your taxes, or you'll need a Tax-Evasion lawyer.
I would think the litmus test would be whether the viewing was "open to the public" or not. Make it invite-only. If I can walk in off-the-street, whether I pay or not, and view the feature, isn't that "viewing in/by [the] public"?