You can't go by what's available for sale. All of my secure mobi ebooks that have a download link can be downloaded even the ones that are no longer sold. I have a number of mobi ebooks that are expired and without checking every one it appears that those are the ones that were withdrawn when one of the content servers stopped using Fictionwise. The same is true for my secure eReader and Microsoft Reader ebooks. It's only a handful of my secure ePub ebooks that have a download link are not downloadable.
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