Amazon and other sellers can ship overseas because they are selling FROM the territory where they have contracts to sell the book. A store in the US doesn't have to ask for customer ID to make sure the customer is American before selling a book. A Briton in the US can buy a US-only book and take it back to the UK regardless of contracts, and shipping a book overseas is the same thing. It's the distribution contracts that have the limits.
Selling an ebook overseas is seen as a different kind of transaction - and for the moment appears to be be considered to occur at the purchaser's location not the seller's.
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