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Old 11-28-2011, 03:59 PM   #1
bonzi
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Question How to recognize DRM-ed files?
OK, I know that .mobi and .prc files I have laying around on my Kindles and PCs are not DRM-ed. However, I have quite a lot of .azw files that are result of Amazon conversion service, and probably one or two books bought from Amazon where the publisher opted to omit DRM.

Is there an easy way (as in something one can put into one's magic file for use by file command) to tell whether an azw file is DRM-ed or not?

Thanks!
Last edited by bonzi; 11-28-2011 at 04:41 PM. Reason: Typo in title
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Old 11-28-2011, 04:06 PM   #2
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Try opening it in calibre's built-in reader. If it's DRM'd, calibre will tell you so.
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Old 11-28-2011, 04:21 PM   #3
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Quote:
Originally Posted by bonzi View Post
OK, I know that .mobi and .prc files I have laying around on my Kindles and PCs are not DRM-ed. However, I have quite a lot of .azw files that are result of Amazon conversion service, and probably one or two books bought from Amazon where the publisher opted to omit DRM.

Is there an easy way (as in something one can put into one's magic file for use by file command) to tell whether an azw file is DRM-ed or not?

Thanks!
It looks like you need to check every record in a mobi file order to check if it contains encrypted files, and I have no idea if you can make 'file' do that for you. There's a description of the format here: https://wiki.mobileread.com/wiki/MOBI
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Old 11-28-2011, 04:43 PM   #4
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Quote:
Originally Posted by Utnapishtim View Post
It looks like you need to check every record in a mobi file order to check if it contains encrypted files, and I have no idea if you can make 'file' do that for you. There's a description of the format here: https://wiki.mobileread.com/wiki/MOBI
Thanks! We will see whether I am ambitious enough
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Old 11-28-2011, 06:05 PM   #5
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See Kindle Books From Amazon Without DRM for a simple python script that checks for DRM. This probably could be implemented in a magic file.
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Old 11-28-2011, 08:57 PM   #6
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you can also use mobi2mobi to check if it's DRMed. on my computer you can check it by enter the following line:
Quote:
mobi2mobi your_book_name.azw | grep -a drm
if it's DRMed, it'll show something like the this
Quote:
EXTH item: 3 - drm_ebookbase_book_id - 13 - 0000000379432
if it's not, it won't show anything.
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Old 11-29-2011, 01:41 AM   #7
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Originally Posted by shinew View Post
you can also use mobi2mobi to check if it's DRMed. on my computer you can check it by enter the following line:

if it's DRMed, it'll show something like the this


if it's not, it won't show anything.
Perfect! I needed something to use in scripts. Thanks!
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