I'm not sure how the exclusive sale model would work with information. Some problems I see are:

1. You can't prove a negative. The seller cannot prove that there's not a copy of the same information elsewhere.

2. If you prevent the same data from being sold again, the exclusive owner is also prevented from selling. What if that person wants to sell bits and pieces of the information as an arbitrage play?

3. Doesn't this obligate the police to bid for any child pornography whatever the cost?