Amazon adopted epub several years ago. Publishers provide files to them as plain epub files. What they sell is an epub file in a proprietary wrapper. The wrapper exists, in part, to provide the DRM. If they remove the DRM, they can remove the wrapper and give you a plan epub file.
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Amazon adopted epub several years ago. Publishers provide files to them as plain epub files. What they sell is an epub file in a proprietary wrapper. The wrapper exists, in part, to provide the DRM. If they remove the DRM, they can remove the wrapper and give you a plan epub file.