I have bought a DRM protected PDF ebook. No problem with the download and it is possible to read it with ADE.
But I would like to convert it to an epub as my Kobo reader's way of showing PDF is completely unsatisfactory.
I cannot do this with calibre, it says there: "Not possible due to DRM".
Guess you have fixed this problem.
Just leave several recommendations here for those who may run into this same situation.
To get good PDF to ePub results, a dedicated converter is better.
1 PDFMate PDF Converter Professional
PDFMate is a PDF tool integrating the function of converting and manging PDF files for Windows users. Users can merge, crop, split, protect and customize PDFs, also export PDFs as Word, Text, ePub, Image, HTML, SWF. Even you can convert JPG to PDF.
2 xilisoft PDF to ePub Converter
With only 2 steps, Xilisoft PDF to ePub converter will get PDF files in ePub format. It supports batch conversion and process conversion very fast. Comparing with counterparts, this tool brings high quality ePub file in the same formatting as original PDF file.