Quote:
Originally Posted by DNSB
I think the main issue there is the size of the image files. The cover.jpg in the SDRM file is 2,090,855 bytes while the image file in the ADRM file is 740,754 bytes. Oddly, most of the image files are different between the two versions though the resolution is the same with the SDRM having 3,404,872 bytes total in images while the ADRM has 1,978,103 bytes in images.
As another oddity, the xhtml files in the SDRM have the DOCTYPE declaration while the xhtml files in the ADRM do not.
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I bought a copy of this book and was able to download it with SDRM.
From comparing with calibre, I think I may have found what to do to remove the DRM.
Load the eBook into the calibre editor. Losslessly compress the images to remove any metadata. Then in the list of HTML files I have an HTML file with a bunch of letters and number that makes no sense (at the end of the list of HTML). Inside that HTML file is a <p> that is set not to display that has a long string of letters/number. I think that could be the watermark. Delete this file as it is not part of the eBook. After this, save and you have a DRM free ePub.