I don't play ps3 often, so I have a profile to separate my saves from my husband's but no PSN account. However, I'm quite enamored with Bioshock Infinite and I'm excited for the upcoming DLC "Burial at Sea". If my husband purchases the DLC, will I be able to play it in my profile? Or will we need to purchase two copies? Will this change if I sign up for PSN?
(Inspired by I have DLC and want 2 PSN accounts, but I didn't see any question covering this particular use case on the site already.)