kindledrm checks AZW files to see if they include DRM.

Copy kindledrm.py and prc.py to the directory containing the AZW files
(or add them to your path).  Then in a Windows command terminal:

echo off
for  %a in (*.azw) do kindledrm "%a"
echo on

Or do the equivalent in Linux or OSX.

Note that kindledrm is not touching the file's DRM, it just looks at a 
2-byte integer in the header that indicates the presence if DRM.
