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I wonder if the encryption decision applies at time of purchase, or at time of download. It's been described here as time of purchase, but if I understand the process correctly, the decision is made at the beginning of the download, based on the client.
B&N and Amazon occasionally put updated versions of already-purchased books in your online account. And I occasionally check for and download new versions of books I already purchased, in the hope of finding errors corrected and/or improved formatting.
I've only bought a few books from Google, Kobo, etc., so I don't know if you can "re-download" previously purchased books using standard Adobe DRM.
I can see a company wanting to "close the loophole" of previously purchased books using easily-defeated DRM, and so upgrading the encryption if a new copy is downloaded.
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