Evolution of the book over the time

[monster_masterpiece]

Hello,
Previously people were limited to classic books where nowadays you could have your audio book or even PDF book that cancels the VAT of the transfert fee so just you need to register on a platform that allows subscriptions like Amazon Kiddle and start selling your copywritted electronic version of book.
However you should protect from reselling your book elsewhere as some people purchase electronic version and resell it lower price which is not smart practice.