They expire and quit working after the check-out period, but don't necessarily automatically delete. ADE books will show as "expired" in the ADE library on your computer, but should be deleted manually (drop-down option in the library), more to keep the clutter out of your library than for any other reason, because they won't work anyway. Some readers (and mp3 players for audiobooks) don't have clocks and books will continue to work on them after the expiration date. I think that is mainly what they're talking about when it comes to manually deleting the files.
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