diff --git a/README.md b/README.md
index d8de1ac..335b901 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,7 @@ Dvoupanelový souborový manažer podobný Total Commander, vytvořený v Java 1
 
 ```bash
 mvn clean compile
-mvn exec:java -Dexec.mainClass="com.kfmanager.MainApp"
+mvn exec:java -Dexec.mainClass="cz.kamma.kfmanager.MainApp"
 ```
 
 Nebo vytvoření JAR souboru:
diff --git a/pom.xml b/pom.xml
index 21f1756..3d719c0 100644
--- a/pom.xml
+++ b/pom.xml
@@ -5,7 +5,7 @@
          http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
-    <groupId>com.kfmanager</groupId>
+    <groupId>cz.kamma.kfmanager</groupId>
     <artifactId>kf-manager</artifactId>
     <version>1.0-SNAPSHOT</version>
     <packaging>jar</packaging>
@@ -54,7 +54,7 @@
                 <configuration>
                     <archive>
                         <manifest>
-                            <mainClass>com.kfmanager.MainApp</mainClass>
+                            <mainClass>cz.kamma.kfmanager.MainApp</mainClass>
                         </manifest>
                     </archive>
                 </configuration>
@@ -69,7 +69,7 @@
                     </descriptorRefs>
                     <archive>
                         <manifest>
-                            <mainClass>com.kfmanager.MainApp</mainClass>
+                            <mainClass>cz.kamma.kfmanager.MainApp</mainClass>
                         </manifest>
                     </archive>
                 </configuration>
diff --git a/src/main/java/com/kfmanager/MainApp.java b/src/main/java/cz/kamma/kfmanager/MainApp.java
similarity index 90%
rename from src/main/java/com/kfmanager/MainApp.java
rename to src/main/java/cz/kamma/kfmanager/MainApp.java
index 92985ce..15185e7 100644
--- a/src/main/java/com/kfmanager/MainApp.java
+++ b/src/main/java/cz/kamma/kfmanager/MainApp.java
@@ -1,6 +1,6 @@
-package com.kfmanager;
+package cz.kamma.kfmanager;
 
-import com.kfmanager.ui.MainWindow;
+import cz.kamma.kfmanager.ui.MainWindow;
 
 import javax.swing.*;
 
diff --git a/src/main/java/com/kfmanager/config/AppConfig.java b/src/main/java/cz/kamma/kfmanager/config/AppConfig.java
similarity index 99%
rename from src/main/java/com/kfmanager/config/AppConfig.java
rename to src/main/java/cz/kamma/kfmanager/config/AppConfig.java
index 2969e3c..6087747 100644
--- a/src/main/java/com/kfmanager/config/AppConfig.java
+++ b/src/main/java/cz/kamma/kfmanager/config/AppConfig.java
@@ -1,4 +1,4 @@
-package com.kfmanager.config;
+package cz.kamma.kfmanager.config;
 
 import java.awt.*;
 import java.io.*;
diff --git a/src/main/java/com/kfmanager/model/FileItem.java b/src/main/java/cz/kamma/kfmanager/model/FileItem.java
similarity index 98%
rename from src/main/java/com/kfmanager/model/FileItem.java
rename to src/main/java/cz/kamma/kfmanager/model/FileItem.java
index a7b65e8..8bab761 100644
--- a/src/main/java/com/kfmanager/model/FileItem.java
+++ b/src/main/java/cz/kamma/kfmanager/model/FileItem.java
@@ -1,4 +1,4 @@
-package com.kfmanager.model;
+package cz.kamma.kfmanager.model;
 
 import javax.swing.Icon;
 import javax.swing.filechooser.FileSystemView;
diff --git a/src/main/java/com/kfmanager/service/FileOperations.java b/src/main/java/cz/kamma/kfmanager/service/FileOperations.java
similarity index 99%
rename from src/main/java/com/kfmanager/service/FileOperations.java
rename to src/main/java/cz/kamma/kfmanager/service/FileOperations.java
index caaf3b3..5179b16 100644
--- a/src/main/java/com/kfmanager/service/FileOperations.java
+++ b/src/main/java/cz/kamma/kfmanager/service/FileOperations.java
@@ -1,6 +1,6 @@
-package com.kfmanager.service;
+package cz.kamma.kfmanager.service;
 
-import com.kfmanager.model.FileItem;
+import cz.kamma.kfmanager.model.FileItem;
 
 import java.io.*;
 import java.nio.file.*;
diff --git a/src/main/java/com/kfmanager/ui/DriveSelector.java b/src/main/java/cz/kamma/kfmanager/ui/DriveSelector.java
similarity index 99%
rename from src/main/java/com/kfmanager/ui/DriveSelector.java
rename to src/main/java/cz/kamma/kfmanager/ui/DriveSelector.java
index c588d61..3292509 100644
--- a/src/main/java/com/kfmanager/ui/DriveSelector.java
+++ b/src/main/java/cz/kamma/kfmanager/ui/DriveSelector.java
@@ -1,4 +1,4 @@
-package com.kfmanager.ui;
+package cz.kamma.kfmanager.ui;
 
 import javax.swing.*;
 import java.awt.*;
diff --git a/src/main/java/com/kfmanager/ui/FileEditor.java b/src/main/java/cz/kamma/kfmanager/ui/FileEditor.java
similarity index 99%
rename from src/main/java/com/kfmanager/ui/FileEditor.java
rename to src/main/java/cz/kamma/kfmanager/ui/FileEditor.java
index 2d836d4..9a0813c 100644
--- a/src/main/java/com/kfmanager/ui/FileEditor.java
+++ b/src/main/java/cz/kamma/kfmanager/ui/FileEditor.java
@@ -1,6 +1,6 @@
-package com.kfmanager.ui;
+package cz.kamma.kfmanager.ui;
 
-import com.kfmanager.config.AppConfig;
+import cz.kamma.kfmanager.config.AppConfig;
 
 import javax.swing.*;
 import java.awt.*;
diff --git a/src/main/java/com/kfmanager/ui/FilePanel.java b/src/main/java/cz/kamma/kfmanager/ui/FilePanel.java
similarity index 99%
rename from src/main/java/com/kfmanager/ui/FilePanel.java
rename to src/main/java/cz/kamma/kfmanager/ui/FilePanel.java
index 48c6993..ff1e366 100644
--- a/src/main/java/com/kfmanager/ui/FilePanel.java
+++ b/src/main/java/cz/kamma/kfmanager/ui/FilePanel.java
@@ -1,6 +1,6 @@
-package com.kfmanager.ui;
+package cz.kamma.kfmanager.ui;
 
-import com.kfmanager.model.FileItem;
+import cz.kamma.kfmanager.model.FileItem;
 
 import javax.swing.*;
 import java.awt.*;
@@ -16,7 +16,7 @@ public class FilePanel extends JPanel {
     private JTabbedPane tabbedPane;
     private JComboBox<File> driveCombo;
     private JLabel driveInfoLabel;
-    private com.kfmanager.config.AppConfig appConfig;
+    private cz.kamma.kfmanager.config.AppConfig appConfig;
     private Runnable onDirectoryChangedAll;
     
     public FilePanel(String initialPath) {
@@ -290,7 +290,7 @@ public class FilePanel extends JPanel {
     /**
      * Provide AppConfig so tabs can persist/retrieve sort settings
      */
-    public void setAppConfig(com.kfmanager.config.AppConfig cfg) {
+    public void setAppConfig(cz.kamma.kfmanager.config.AppConfig cfg) {
         this.appConfig = cfg;
         // propagate to existing tabs
         for (int i = 0; i < tabbedPane.getTabCount(); i++) {
diff --git a/src/main/java/com/kfmanager/ui/FilePanel.java.bak b/src/main/java/cz/kamma/kfmanager/ui/FilePanel.java.bak
similarity index 99%
rename from src/main/java/com/kfmanager/ui/FilePanel.java.bak
rename to src/main/java/cz/kamma/kfmanager/ui/FilePanel.java.bak
index 1b722a5..9f52bb1 100644
--- a/src/main/java/com/kfmanager/ui/FilePanel.java.bak
+++ b/src/main/java/cz/kamma/kfmanager/ui/FilePanel.java.bak
@@ -1,6 +1,6 @@
-package com.kfmanager.ui;
+package cz.kamma.kfmanager.ui;
 
-import com.kfmanager.model.FileItem;
+import cz.kamma.kfmanager.model.FileItem;
 
 import javax.swing.*;
 import javax.swing.filechooser.FileSystemView;
diff --git a/src/main/java/com/kfmanager/ui/FilePanelTab.java b/src/main/java/cz/kamma/kfmanager/ui/FilePanelTab.java
similarity index 99%
rename from src/main/java/com/kfmanager/ui/FilePanelTab.java
rename to src/main/java/cz/kamma/kfmanager/ui/FilePanelTab.java
index 5fa4432..f5e5739 100644
--- a/src/main/java/com/kfmanager/ui/FilePanelTab.java
+++ b/src/main/java/cz/kamma/kfmanager/ui/FilePanelTab.java
@@ -1,6 +1,6 @@
-package com.kfmanager.ui;
+package cz.kamma.kfmanager.ui;
 
-import com.kfmanager.model.FileItem;
+import cz.kamma.kfmanager.model.FileItem;
 
 import javax.swing.*;
 import javax.swing.table.AbstractTableModel;
@@ -50,7 +50,7 @@ public class FilePanelTab extends JPanel {
     // Sorting state for FULL mode header clicks
     private int sortColumn = -1; // 0=name,1=size,2=date
     private boolean sortAscending = true;
-    private com.kfmanager.config.AppConfig persistedConfig;
+    private cz.kamma.kfmanager.config.AppConfig persistedConfig;
     // Track last selection to restore it if focus is requested on empty area
     private int lastValidRow = 0;
     private int lastValidBriefColumn = 0;
@@ -1280,7 +1280,7 @@ public class FilePanelTab extends JPanel {
                 
                 new Thread(() -> {
                     try {
-                        com.kfmanager.service.FileOperations.delete(toDelete, new com.kfmanager.service.FileOperations.ProgressCallback() {
+                        cz.kamma.kfmanager.service.FileOperations.delete(toDelete, new cz.kamma.kfmanager.service.FileOperations.ProgressCallback() {
                             @Override
                             public void onProgress(long current, long total, String currentFile) {
                                 progressDialog.updateProgress(current, total, currentFile);
@@ -2035,7 +2035,7 @@ public class FilePanelTab extends JPanel {
     /**
      * Provide AppConfig so this tab can persist and restore sort settings.
      */
-    public void setAppConfig(com.kfmanager.config.AppConfig cfg) {
+    public void setAppConfig(cz.kamma.kfmanager.config.AppConfig cfg) {
         this.persistedConfig = cfg;
         // Apply persisted sort if present
         if (cfg != null) {
@@ -2275,7 +2275,7 @@ public class FilePanelTab extends JPanel {
 
             // Perform rename using FileOperations and refresh the directory
             try {
-                com.kfmanager.service.FileOperations.rename(item.getFile(), newName);
+                cz.kamma.kfmanager.service.FileOperations.rename(item.getFile(), newName);
                 // reload current directory to reflect updated names
                 FilePanelTab.this.loadDirectory(FilePanelTab.this.getCurrentDirectory());
                 // After reload, select the renamed item and focus the table
diff --git a/src/main/java/com/kfmanager/ui/FontChooserDialog.java b/src/main/java/cz/kamma/kfmanager/ui/FontChooserDialog.java
similarity index 99%
rename from src/main/java/com/kfmanager/ui/FontChooserDialog.java
rename to src/main/java/cz/kamma/kfmanager/ui/FontChooserDialog.java
index be998d9..6392ebf 100644
--- a/src/main/java/com/kfmanager/ui/FontChooserDialog.java
+++ b/src/main/java/cz/kamma/kfmanager/ui/FontChooserDialog.java
@@ -1,4 +1,4 @@
-package com.kfmanager.ui;
+package cz.kamma.kfmanager.ui;
 
 import javax.swing.*;
 import java.awt.*;
diff --git a/src/main/java/com/kfmanager/ui/MainWindow.java b/src/main/java/cz/kamma/kfmanager/ui/MainWindow.java
similarity index 99%
rename from src/main/java/com/kfmanager/ui/MainWindow.java
rename to src/main/java/cz/kamma/kfmanager/ui/MainWindow.java
index 864c547..cbcfe0a 100644
--- a/src/main/java/com/kfmanager/ui/MainWindow.java
+++ b/src/main/java/cz/kamma/kfmanager/ui/MainWindow.java
@@ -1,9 +1,9 @@
-package com.kfmanager.ui;
+package cz.kamma.kfmanager.ui;
 
-import com.kfmanager.MainApp;
-import com.kfmanager.config.AppConfig;
-import com.kfmanager.model.FileItem;
-import com.kfmanager.service.FileOperations;
+import cz.kamma.kfmanager.MainApp;
+import cz.kamma.kfmanager.config.AppConfig;
+import cz.kamma.kfmanager.model.FileItem;
+import cz.kamma.kfmanager.service.FileOperations;
 
 import javax.swing.*;
 import java.awt.*;
diff --git a/src/main/java/com/kfmanager/ui/ProgressDialog.java b/src/main/java/cz/kamma/kfmanager/ui/ProgressDialog.java
similarity index 99%
rename from src/main/java/com/kfmanager/ui/ProgressDialog.java
rename to src/main/java/cz/kamma/kfmanager/ui/ProgressDialog.java
index 3a4c420..dc055a9 100644
--- a/src/main/java/com/kfmanager/ui/ProgressDialog.java
+++ b/src/main/java/cz/kamma/kfmanager/ui/ProgressDialog.java
@@ -1,4 +1,4 @@
-package com.kfmanager.ui;
+package cz.kamma.kfmanager.ui;
 
 import javax.swing.*;
 import java.awt.*;
diff --git a/src/main/java/com/kfmanager/ui/PropertiesDialog.java b/src/main/java/cz/kamma/kfmanager/ui/PropertiesDialog.java
similarity index 99%
rename from src/main/java/com/kfmanager/ui/PropertiesDialog.java
rename to src/main/java/cz/kamma/kfmanager/ui/PropertiesDialog.java
index 738cb7b..6d935a0 100644
--- a/src/main/java/com/kfmanager/ui/PropertiesDialog.java
+++ b/src/main/java/cz/kamma/kfmanager/ui/PropertiesDialog.java
@@ -1,4 +1,4 @@
-package com.kfmanager.ui;
+package cz.kamma.kfmanager.ui;
 
 import javax.swing.*;
 import javax.swing.border.EmptyBorder;
diff --git a/src/main/java/com/kfmanager/ui/SearchDialog.java b/src/main/java/cz/kamma/kfmanager/ui/SearchDialog.java
similarity index 98%
rename from src/main/java/com/kfmanager/ui/SearchDialog.java
rename to src/main/java/cz/kamma/kfmanager/ui/SearchDialog.java
index b6b9a7a..b1ce2b4 100644
--- a/src/main/java/com/kfmanager/ui/SearchDialog.java
+++ b/src/main/java/cz/kamma/kfmanager/ui/SearchDialog.java
@@ -1,7 +1,7 @@
-package com.kfmanager.ui;
+package cz.kamma.kfmanager.ui;
 
-import com.kfmanager.model.FileItem;
-import com.kfmanager.service.FileOperations;
+import cz.kamma.kfmanager.model.FileItem;
+import cz.kamma.kfmanager.service.FileOperations;
 
 import javax.swing.*;
 import java.awt.event.KeyEvent;
@@ -33,9 +33,9 @@ public class SearchDialog extends JDialog {
     private volatile int foundCount = 0;
     private File searchDirectory;
     private volatile boolean searching = false;
-    private com.kfmanager.config.AppConfig config;
+    private cz.kamma.kfmanager.config.AppConfig config;
     
-    public SearchDialog(Frame parent, File searchDirectory, com.kfmanager.config.AppConfig config) {
+    public SearchDialog(Frame parent, File searchDirectory, cz.kamma.kfmanager.config.AppConfig config) {
         // Make the dialog modeless so it does not remain forced above other windows
         super(parent, "Search files", false);
         this.searchDirectory = searchDirectory;
diff --git a/src/main/java/com/kfmanager/ui/SettingsDialog.java b/src/main/java/cz/kamma/kfmanager/ui/SettingsDialog.java
similarity index 99%
rename from src/main/java/com/kfmanager/ui/SettingsDialog.java
rename to src/main/java/cz/kamma/kfmanager/ui/SettingsDialog.java
index 23680a8..b18d513 100644
--- a/src/main/java/com/kfmanager/ui/SettingsDialog.java
+++ b/src/main/java/cz/kamma/kfmanager/ui/SettingsDialog.java
@@ -1,6 +1,6 @@
-package com.kfmanager.ui;
+package cz.kamma.kfmanager.ui;
 
-import com.kfmanager.config.AppConfig;
+import cz.kamma.kfmanager.config.AppConfig;
 
 import javax.swing.*;
 import javax.swing.table.DefaultTableModel;
diff --git a/src/main/java/com/kfmanager/ui/ViewMode.java b/src/main/java/cz/kamma/kfmanager/ui/ViewMode.java
similarity index 83%
rename from src/main/java/com/kfmanager/ui/ViewMode.java
rename to src/main/java/cz/kamma/kfmanager/ui/ViewMode.java
index 1e16d1a..95799bc 100644
--- a/src/main/java/com/kfmanager/ui/ViewMode.java
+++ b/src/main/java/cz/kamma/kfmanager/ui/ViewMode.java
@@ -1,4 +1,4 @@
-package com.kfmanager.ui;
+package cz.kamma.kfmanager.ui;
 
 /**
  * Display mode for the panel