diff --git a/modules/cups.nix b/modules/cups.nix
index 95b7abf..a852cc6 100644
--- a/modules/cups.nix
+++ b/modules/cups.nix
@@ -8,7 +8,10 @@ lib.mkIf config.sbruder.gui.enable {
       enable = true;
       drivers = with pkgs; [
         gutenprint
-      ];
+      ] ++ lib.optional config.sbruder.unfree.allowSoftware (unstable.cups-kyocera-ecosys-m552x-p502x.override {
+        # in Kyocera terms, EU means duplex enabled by default
+        region = "EU";
+      });
     };
     avahi.enable = true;
   };
@@ -19,5 +22,11 @@ lib.mkIf config.sbruder.gui.enable {
       deviceUri = "socket://192.168.178.26";
       model = "${gutenprintWithVersion}://bjc-TS3100-series/expert";
     }
+  ] ++ lib.optionals config.sbruder.unfree.allowSoftware [
+    {
+      name = "elma";
+      deviceUri = "socket://elma.home.sbruder.de";
+      model = "Kyocera/Kyocera ECOSYS P5021cdn.PPD";
+    }
   ];
 }
diff --git a/modules/unfree.nix b/modules/unfree.nix
index 3b8de8a..1d822b3 100644
--- a/modules/unfree.nix
+++ b/modules/unfree.nix
@@ -26,6 +26,7 @@ in
         "vista-fonts"
         "wallpaper-unfree" # defined in users/simon/modules/sway.nix
       ] ++ lib.optionals cfg.allowSoftware [
+        "cups-kyocera-ecosys-m552x-p502x" # exception: the file header says MIT license, but explicitly forbids modifications WTF?
         "drone-runner-exec" # exception: same as drone.io
         "drone.io" # exception: is open source (but has usage restriction)
         "fahclient" # exception: for science