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@retro: That's a different case. In your case you still had the same Adobe key. When you switch to a new Adobe ID, you get a new key, and most probably the old key is lost. Calibre, or any other DRM removal stuff, would need the key with which the ebook was encrypted. If the person having this problem is lucky it might be buried somewhere in a backup, but even then, it probably will be hard to recover it.
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