yeah, it does, but unlike normal games, the serial check is done on their servers, not ur comp.

So they can log what serials get released to the public, to flush out serials that are generated by keygens, that were never released.

Also, since it's done online, they can also block out attempts of trying to use a serial when someone else has already done so.

So it'll be very hard to keygen a good serial. The system is very similar to that of some MMORPGs.