you can also use mobi2mobi to check if it's DRMed. on my computer you can check it by enter the following line:
Quote:
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mobi2mobi your_book_name.azw | grep -a drm
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if it's DRMed, it'll show something like the this
Quote:
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EXTH item: 3 - drm_ebookbase_book_id - 13 - 0000000379432
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if it's not, it won't show anything.