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[MadLordOfMilk]

My first thought was "stop people from getting illegal copies of PDFs," but people are bound to just scan everything anyway (they already do for things without an official PDF). The guess that they might intend to sell them themselves is a logical possibility. Another guess is that they might be changing the PDFs in some drastic way and don't want to deal with people who "just bought the un-updated one" or something. I'm not sure what to make of it.