This serial number check can be done using a simple local database at the Resource (website). Things get a bit more complicated if there are many Resources (say different websites), and you want to prevent credential re-use across all of them. The typical solution outsources serial number checks to some centralized service (or bulletin board) so that a user can’t use the same credential across many different sites.
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There's a second motor at the back, though, which is far more interesting. No, it isn't there to drive the rear axle like on the RAV4 Hybrid. The RS5 has a traditional Quattro setup with a mechanical differential in the middle to distribute power between the front and rear wheels.