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Originally Posted by kennyc
I did however just open the book on my Kindle2 (with wireless turned off).
Now I turned wireless on and it has the same message on the listing - [Loan Ended] and same message when I try to open.
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MobiPocket library books had the expiration date set in the DRM, but this suggests that Amazon might instead be relying on its servers to expire ebooks. Your test was not definitive, because it is possible that the clock on your Kindle isn't accurate except when connected to wireless.
The latest AZW DRM stripping scripts won't strip DRM from time limited ebooks. Based on the python code anyone trying this should get the message:
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Cannot decode library or rented ebooks.
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If Amazon is not actually putting the time limit in the DRM, this won't get activated and the DRM will be stripped.
Based on the description of how it works, books from the
Free Kindle Owner's Lending Library for Amazon Prime Members do not expire. However, you can only borrow one at a time, i.e. return one before checking out the next. So they presumably don't have a time limit in the DRM.