[knever]

I know this is an old thread, but something relevant that seems to work so I can use puchased Kindle content on either my Kindle or my eReader is:

1) following instructions in Apprentice Alf's tools_v4.8.zip/ DeDRM_for_Mac_and_Win / WinApp_2.8 / ReadMe_DeDRM_WinApp.txt, using:
a) ActiveState ActivePython-2.7.2.5-win32-x86 . Community Edition
b) pycrypto-2.3.win32-py2.7
c) DeDRM_WinApp_2.8 out of Apprentice Alf's tools_v4.8
d) Calibre 0.8.28

2) following instructions and specifying the encrypted Topaz file X.azw in DeDRM produced 3 outputs:
a) X_SVG (zipped folder)
b) X_XML (zipped folder)
c) X_nodrm.htmlz (unzipped file)

3) As reported in this thread, progress with the SVG and XML folders was tedious, but reimporting the nodrm-htmlz file into Calibre allows easy exporting (eg: a PDF file with just adequate layout or an ePub file with reasonable layout and all figures and the search functionality intact).

K.