I always also get a pirated version of whatever Kindle book I buy to put in my personal electronic library. It's only fair to pay the author, publisher and dist

I always also get a pirated version of whatever Kindle book I buy to put in my personal electronic library. It's only fair to pay the author, publisher and distributor their price for it, but I also want to be able to re-read that book decades from now. I'm confident that I'll still be able to read a txt or epub file in 2050, but there's no particular reason to think that I would still be able to access my Kindle eBooks then.