You can buy the digital upgrade from ps3 to ps4 for COD ghosts, but you must have the ps3 disc to play. I have the ps3 copy and the ps4 copy, but my friend wants to do the digital code for his ps4. Is there any way around this? I can not give him my ps3 copy because im not allowed to play my ps4 til christmas so im going to keep it until then. Is there anyone he can use my digital download code and play ghosts without my ps3 disc??