Install DeDRM_tools_10.0.9 into a Flatpak Calibre (Linux)

Summary Calibre flatpak runs sandboxed, so install the DeDRM plugin by extracting DeDRM_tools_10.0.9.zip and loading the inner DeDRM_plugin.zip into Calibre’s plugin loader. If Calibre can’t see the file because of Flatpak sandboxing, copy DeDRM_plugin.zip into a location the flatpak can access (e.g., your home, Desktop, or a flatpak‑exposed folder) or run calibre with access to that file. Steps below assume a standard Flatpak install.

Steps Download and unzip the tools archive: unzip DeDRM_tools_10.0.9.zip inside the extracted folder find DeDRM_plugin.zip (do NOT unzip DeDRM_plugin.zip). Put DeDRM_plugin.zip somewhere the flatpak can read: Recommended: ~/Downloads or ~/Desktop. If you prefer another folder, ensure the flatpak has access (see step 4). Open the flatpak Calibre app: Launch Calibre normally (Applications menu). If Calibre can’t access the file due to sandbox restrictions, either: Move DeDRM_plugin.zip into ~/Downloads, ~/Desktop, or your Home; flatpak apps typically can read these. Or grant the calibre flatpak extra filesystem access (optional): Run: flatpak override –user –filesystem=/path/to/folder com.calibre_ebook.calibre Replace /path/to/folder with the folder containing DeDRM_plugin.zip. Install the plugin in Calibre: Preferences → Plugins (Advanced → Plugins). Click “Load plugin from file”. Navigate to and select DeDRM_plugin.zip (the one extracted from the tools archive). Confirm the security warning and accept the install. Restart Calibre when prompted. Configure DeDRM (if needed): In Plugins list find DeDRM under “File type plugins” (or show only user plugins). Select it → Customise plugin → enter keys/serials (Kindle serials, ADE keys, etc.) per your sources. Test: Remove and re‑import a DRMed book into Calibre; the plugin removes DRM during import.