>> Also it probably has some checksum, you'd need a shed load of stamps to 
>> figure it out probably.
>
> Well, if you were going to reverse-engineer it, sure. But if you could 
> figure out the algorithm...

How are you going to figure out the algorithm without access to lots of 
stamps you know are valid?

> If you *knew* how they generate the barcode, you could put an arbitrary IP 
> address in there.

Isn't the problem here that you're trying to work out how to generate the 
barcode?

>> A bit like that system on Blu-Ray discs, where every player plays back a 
>> very slightly different version, so when someone rips and uploads to 
>> BitTorrent, they can tell exactly which player it was ripped from.
>
> Really? That's news...

http://www.freedom-to-tinker.com/tags/aacs?page=1

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