Thread: OK, what's Kobo SDRM?
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Old 01-22-2026, 06:10 PM   #30
graycyn
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Join Date: Aug 2010
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Quote:
Originally Posted by Cactus Chef View Post
That seems like way too much to be just watermarks. Maybe different image resolutions/compression algorithms being used?

I'd be happy to contribute to the research effort if we could find a target book that wasn't Rowling...
After import into calibre, the filesize column shows 1.8 MB for the SDRM book and 2MB for the Adobe DRM/deDRM import.

Anyway, I definitely think different image stuff is going on, but not change in resolution, those seem the same, it's just image filesize changes, and slight ones.
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