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Part of the problem is right there in the name: e-book. In the print world, the word “book” is used to refer to both the content and the medium. In the digital realm, “e-book” refers to the content only—or rather, that’s the intention. Unfortunately, the conflation of these two concepts in the nomenclature of print naturally carries over to the digital terminology, much to the confusion of all.
This is not the case with music, for example, where the medium and the content are separate. The medium changes—vinyl, 8-track, cassette, CD, MP3—but music is still music. Music is the product. Music is what you’re buying. The medium is just a vessel, and that vessel changes ruthlessly. When a better, cheaper, faster, or more convenient medium appears, the music follows—with or without the content owners.
"John Siracusa: The once and future e-book: on reading in the digital age
