The first time I opened my Kindle “library” on a browser I was surprised: There, next to several titles, was an indication that there is an “Update Available.”
This was the case for books written by authors no longer existent. For books of a recent vintage.
These updates are for the most part invisible to the reader.
There are several reasons why a given book might need an update.
For example, typos could have been identified and of need of fixing. Sometimes the conversion from the page plates to the digital format results in seriously bad breaks that require adjustments.
It could be that a given author who has published a hardcover version of, say, a biography has obtained additional information and so the paperback edition of the book includes that. Consequently, that information might be rolled into the Kindle version of the book.
But there are conceivably other things that could happen that are less benign, especially in this age where we seem to be reverting to book banning: Might someone who is so politically inclined not go into the digital file for a book or several and take a metaphoric ax to the content that she or he feels is in some way inappropriate? For a physical book on a shelf that is something that cannot be done in a way that doesn’t leave the paper in tatters. For the digital book that is something that could go without much notice. This would give a whole new notion to the concept of an “abridged edition.”
The question this raises is when is something “done”? When is it complete?