Quote:
Originally Posted by geca
Since my encrypted key has length of 192 chars this ....
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An encrypted book key of 192 characters means the book is encrypted with the new variant of Adobe's DRM.
In 2014 Adobe introduced a new version of their DRM because the old one is so easy to crack. It didn't gain much popularity (because, well, all eReaders would need to be updated to support it), but it looks like some vendors have recently switched to that new version.
There is no known public method to remove DRM from these books. One would need to reverse-engineer RMSDK to figure out how this new DRM works.