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I got my new key using the "url method." It worked OK the one time I used it (for exploratory purposes only). But my plan is to just not buy from B&N unless I simply can't buy the book anywhere else. Tampermonkey scripts and/or Nook Study (or other discontinued software) combined with url-retrievable encryption hashes all just feels a bit too fragile for my comfort.
If their supported apps can retrieve encryption hashes via url, there's no reason they can't start changing those hashes every other day—or discontinuing hashes for unsupported PC or Mac type programs altogether. Meaning people would be reduced to rooting Nook/Android devices to retrieve files and sniffing network packets to discover the "hash o' the day." No thanks.
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