Did it convert it to .epub? If so you can remove epub DRM with Calibre and the DRM recover plugin
It popped up in calibre and knew the title but wouldn't open. I didn't see a dedrm button or option.
You have to install the plugin. You can get it from https://github.com/ramanveerji/DeDRM_tools . It removes DRM automatically when adding a book to the library.
