>>> 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?

I suppose the fatal assumption here is that the encoding of the 
information into the barcode is trivial. If these guys are sensible, it 
won't be...

>>> 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

Interesting. So the film actually ends a different way depending on 
which player you play it with?

I bet that'll be popular...

[But then again, all these copywrite notices and "piracy is stealing" 
ads and aggressive copy-protection systems only piss off paying 
customers. They have no effect on criminals...]

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