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Originally Posted by Cinisajoy
Amazon offers DRM as an option. If they didn't have that option none of the big 5 would let Amazon distribute their books.
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Easy enough. Amazon would be able to refuse to sell ANY books from the big 5. Then all of the big five would *die*. Yes, it would cost Amazon a lot of money in the beginning, but they have a lot of extra sources of revenue.
In the end, all of the big five would need to get on board or be destroyed. As big as they are, they only have one way to make money: book publishing. Amazon has a gazillion ways, from selling clothing and toys, even up to providing cloud services and hired computing.
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I do believe a couple of other ebook sellers require their security (drm) attached to all their files. I think Apple and Google are two of them?
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I don't know. All iBooks I've ever seen had Apple's DRM tough, and I never used Google books.
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Now on the other side, why should books only be epub? What about pdf? Or do you consider that a document file?
What is so great about epub?
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What's great about epub is that it can be edited by many tools; not only Calibre, the Calibre Editor or Sigil. As far as I know, Amazon even creates its own formats on the basis of an EPUB.
I consider PDF's documents, but not e-books. PDF was created as a fixed-layout printable format. While it can be used as an ebook (obviously), it wasn't its original purpose.
Personally I only consider only file formats to be e-books if they were developed as such; EPUB, MOBI, AZW3, LIT, LRF, that sort of thing.
If you don't, every format could be tagged as being an e-book, even plain TXT-files. In my view, any (text) format not specifically developed to be an e-book, is an electronic document.