Don't get any bright ideas about trading in DC Universe Online for a newer game - you can't.
It's an MMO; it's not allowed.
"Once the PSN key has been consumed with a disk it cannot be resold / replayed with the second user adding a sub. Only the original consumer can use that account. Disk and account are one," a Sony rep told QuickJump.
PC gamers are familiar with this approach, but for console gamers it's a step beyond Online Pass, i.e. buy the game second-hand and pay around $10 to unlock multiplayer.
Sony Online Entertainment, maker of DC Universe Online, doesn't offer spare paid-for activation codes. The code supplied with the disc is all there is.