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Old 12-29-2015, 09:38 AM   #6
darryl
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Posts: 3,108
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Join Date: Nov 2011
Location: Australia
Device: Kobo Aura H2O, Kindle Oasis, Huwei Ascend Mate 7
I will elaborate. The Linux file command will identify drm protected Adobe epubs as epub files. If unzipped, the contents of the Adobe protected epub files do appear to be similar to the contents of your file. However, the file command identifies this as a zip file rather than an epub one. Likewise, trying to open an Adobe drm protected file with Calibre's Ebook viewer produces an error message that the Book is protected by DRM. Opening your file in Calibre's Ebook viewer produces an error about missing spine contents.

I may not have been correct to say that it is not an epub, though both Calibre and the Linux file command seem to normally identify even an encrypted epub as such. It may simply be missing something that these programs expect to see.

It appears that your application is now using DRM. Without knowing the application and the type of drm being used you will not have much luck. What is the application? Can you read only in the application?
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