Calibre supports plug-ins.
I have seen a thread that you can use python plug-ins to remove DRM with Calibre.
Quote:
Released version 119 with support for plugins. My private install of calibre now transparently strips the DRM from my purchased MOBI files
I haven't documented how to create plugins as yet, but the code is well commented in src/calibre/customize/__init__.py and src/calibre/customize/builtins.py
Just create a .py plugin name it something_plugin.py and add it to a zip file. You can then use the config dialog or the calibre-customize command to add the plugin to your calibre installation.
There are example plugins in builtins.py
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Where can I find DRM removal plug-ins for Calibre?