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Sirtel has it right. If the book's been through Alf's tools, it's not AZW. It might be HTMLZ or MOBI or AZW3. If it's AZW, it was imported without Alf's tools touching it.
That doesn't mean that all AZW books in your calibre library have DRM. If the book was sold without DRM, the AZW (if not KFX format) will not have DRM.
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