I was also wondering how this works. I'm primarily buying the upgrade for my son and it will be for his account but I will be playing some as well. When I purchase DLC for his account on the PS3 I can also play it on my profile. I just want to know whether it will be the same on the PS4. If I purchase the digital copy under my son's account will I also be able to play it on my account like I could on the PS3?