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You would need to remove the DRM before Calibre could convert it. I do not want to start a discussion on the rights and wrongs of this but I had the same problem with a PDF library book - I found it really un-readable regardless of the zoom, landscape settings etc. I did remove the DRM and convert it to read it. Once read, I then deleted the epub version and returned the PDF to the library. The converted version was far from perfect as I did not spend a lot of time setting up custom parameters but it was readable!
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