Thanks to Jorgen for a link to this Christian Science Monitor story about Amazon sometimes updating eBooks with patches and narrative fixes. This is causing some controversy among literary purists who feel that a book is inviolate once the writer has signed off.
I think updates make perfect sense with science and textbooks to keep up with advances, though it could present dangers for fiction writers.
We’ve all read books that had the art and spontaneity re-written out of them.