Let us be clear
I have DeDRM'd smaller files (from the same publisher) and converted them to epub very quickly, and without a hitch
It is the larger files which cause problems
Those plugins work if your e-reader is connected to your PC (it deosn't find the PIDs all the time) but the other software does (every time).
I have two files which give the 'spine is empty' error message. One is 30.3MB and the other is 36.4MB. Unofficial or not, those plugins worked on the smaller files.
This is an OEB error, a large file-handling error. Small files with limited TOCs and chapters convert easily. I HAVE CONVERTED OVER 200 OF THEM
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