[any ANONYMOUS forum user]

Calibre supports plug-ins.

I have seen a thread that you can use python plug-ins to remove DRM with Calibre.

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

Where can I find DRM removal plug-ins for Calibre?