When this library expiration topic first came up my curiousity got the best of me. I went to the ade library and dragged one of the EXPIRED books into Calibre. With the appropriate plugin, it was still able to remove the drm from the expired book. So the book itself is not changed in anyway as it "expires." The reader finds some "key" in the book or the reader keeps its own "table" and then expires the book.
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