That's not a problem with Ebooks writ large -- a zip file of a bunch of HTML documents aren't likely to randomly change on you. It's a problem of some evil vendor's "ebook ecosystem", where one day your copy of 1984 could vanish from your library. Most of the ebooks I've been reading lately are all public domain classics from Standard Ebooks.
I was shocked to discover that "How To Win Friends and Influence People" by Dale Carnegie was heavily rewritten by his wife after his death. I had two copies of the book, and sure enough, one was the old version and the other the new. The new one did not withstand scrutiny.
Hacker News' founder Paul Graham also recommends that you read the original version[1]. I'm curious to see examples of what was changed in the revision. I read it myself a long time ago, but I don't know which one it was and wondering if I missed out on the better version.
Well no, you can only be 100% certain you're reading the text found in that book. Books often change over releases. It's not some sacred tome containing an ever-updating reflection of the author's ideals. It's just the draft at the time the book was printed.
Not the same thing. The kindle ebook you "purchased" could have different text each time you open it up. A movie you stream could be different every time.
Reading your comment I wonder if the parent comment is different each time, because "does the ebook text change reading-to-reading" is not the question being discussed.