Excellent article!
…one more thing. The Data Rights Management software on Kindle’s means that Amazon can take away the books you think you have purchased whenever Amazon feels they have the justification. This has happened for quite lightweight reasons; people have actually woken up in the morning to discover that they can no longer access their Kindle books.
Therefore: if you do have a Kindle, then do remove the DRM.
Google “Remove the DRM From Amazon Kindle Books”