Everyone keeps telling me that they can't ban used games, because certain regions and countries have laws preventing them from doing so.
Plus, all of those ideas sound incredibly anti-consumer. Doesn't matter where they go, if developers start adopting those ideas they're going to lose sales to the people that don't restrict their customers. People don't like restrictions.
If you're not going to share with the entire class, then don't bother sharing at all. Online is the worst thing to happen to gaming.