>> Now I'm thinking... it appears to be a standard Data Matrix barcode, so
>> if I could figure out WTF the data encoded in it is, I could print as
>> many of them as I like, without a fee...
> 
> Until you got caught, that is, and fined/put in jail for fraud.... ;-)

Would they actually bother for 21p?

Now, if I wrote an automated program to print these stamps and posted it 
on the Internet... *then* they might have a case. :-P

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