UpRev, buying a used cable

DEpointfive0

So, I don't really understand how the cable system works, so sorry for the stupid questions.

An acquaintance is selling the tuner version with the cable and he said the license is back on the cable.
The tuner version is the only version that you can use then resell when you're "done" right?
Do I need to register it to my my car, and does it cost anything to do that?
And how can I make sure that the license is back on the cable so I don't get ripped off?


Thanks in advance,
Andrew

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