diff --git a/lib/pages/android_file_picker_page.dart b/lib/pages/android_file_picker_page.dart
index 512771c..154a8e4 100644
--- a/lib/pages/android_file_picker_page.dart
+++ b/lib/pages/android_file_picker_page.dart
@@ -1,5 +1,6 @@
 /// Modified based on the example of library `file_manager`:
 /// https://github.com/DevsOnFlutter/file_manager/blob/main/example/lib/main.dart
+/// Originally distributed under BSD-3-Clause license
 
 import 'dart:io';
 
@@ -73,7 +74,7 @@ class _AndroidFilePickerState extends State<AndroidFilePicker> {
                           // open the folder
                           controller.openDirectory(entity);
                         } else {
-                          // select a file
+                          // select or unselect a file
                           setStateS(() {
                             if (_selected.contains(entity)) {
                               _selected.remove(entity);
@@ -83,6 +84,16 @@ class _AndroidFilePickerState extends State<AndroidFilePicker> {
                           });
                         }
                       },
+                      onLongPress: () async {
+                        // select or unselect a file or a dir
+                        setStateS(() {
+                          if (_selected.contains(entity)) {
+                            _selected.remove(entity);
+                          } else {
+                            _selected.add(entity);
+                          }
+                        });
+                      },
                     ),
                   );
                 },
diff --git a/lib/pages/rules_page.dart b/lib/pages/rules_page.dart
index 80b68cb..498097e 100644
--- a/lib/pages/rules_page.dart
+++ b/lib/pages/rules_page.dart
@@ -62,6 +62,7 @@ class RulesPageState extends State<RulesPage> {
       children: [
         Row(
           children: [
+            box,
             Expanded(
               child: CustomDrop<String>(
                 value: Shared.ruleName,
diff --git a/license_checker_config.yaml b/license_checker_config.yaml
new file mode 100644
index 0000000..e165095
--- /dev/null
+++ b/license_checker_config.yaml
@@ -0,0 +1,17 @@
+permittedLicenses:
+  - MIT
+  - BSD-2-Clause
+  - BSD-3-Clause
+  - Apache-2.0
+  - MIT
+  - MPL
+  - LGPL
+  - GPLv2+
+  - GPLv3
+  - AGPL
+
+rejectedLicenses:
+  - GPLv2
+
+omitDisclaimer:
+  - angles
\ No newline at end of file