Let's say you go to Barnes & Noble and purchase the latest thriller. You are reading it, totally engrossed. You want to keep reading, but finally fall asleep late at night. In the morning, you wake up and your book is gone. In its place is a small pile of money exactly equal to the purchase price of the book.
Well, it happened to thousands of people recently. Amazon removed a couple of e-books from thousands of Kindles recently claiming the versions they sold were still under copywrite protection. Ironically, two of the books involved were 1984 and Animal Farm. As you may expect, Amazon is being sued over this already.
This action leads to all kinds of questions about the ownership of digital media. If you buy some digital music, you can always burn it to CD or transfer it to another hard drive not connected to the internet. With media like the Kindle, there is no way to transfer it to another device. Therefore, Amazon always has the option to delete it (and they have).
Let's go to the next step. Any online information is subject to change. We are now at Orwell's point where history can start being rewritten easily. We have all seen it on some local blogs where the author goes back and changes his original posting after criticisms are made. People here are free to remove comments (I will admit I have edited blogs after posting for bad errors, but I use strikethrough for the original text so everyone can see the changes I made). However, many amateur bloggers don't exactly hold themselves to very high standards in case you haven't noticed.
The Internet Archive attempts to help by taking regular snapshots of the internet. I have found it difficult to use and incomplete, unfortunately. I applaud them for their effort as any organization that attempts to stop potential shenanigans with history has my support.