If the substance of your E-book is classified or in other word confidential you can password protect your E-book so it will not be read by anybody except you. So with this available feature you can keep it private and no need to hide it anywhere.
If you are a reader then you should know the advantages of an E-book over the traditional paperback books. If you are really a reader and really love to read everyday then you should love E-books and be thankful of its existence.
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