diff --git a/src/main/java/tech/ailef/dbadmin/external/annotations/package-info.java b/src/main/java/tech/ailef/dbadmin/external/annotations/package-info.java
index 3821811..d9c4a61 100644
--- a/src/main/java/tech/ailef/dbadmin/external/annotations/package-info.java
+++ b/src/main/java/tech/ailef/dbadmin/external/annotations/package-info.java
@@ -1,3 +1,21 @@
+/*
+ * Spring Boot Database Admin - An automatically generated CRUD admin UI for Spring Boot apps
+ * Copyright (C) 2023 Ailef (http://ailef.tech)
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 /**
  * Annotations defined to allow user customization
  */
diff --git a/src/main/java/tech/ailef/dbadmin/external/controller/package-info.java b/src/main/java/tech/ailef/dbadmin/external/controller/package-info.java
index 24b19bc..1fc8f8f 100644
--- a/src/main/java/tech/ailef/dbadmin/external/controller/package-info.java
+++ b/src/main/java/tech/ailef/dbadmin/external/controller/package-info.java
@@ -1,3 +1,22 @@
+/*
+ * Spring Boot Database Admin - An automatically generated CRUD admin UI for Spring Boot apps
+ * Copyright (C) 2023 Ailef (http://ailef.tech)
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+
 /**
  * Controllers registered for the web UI
  */
diff --git a/src/main/java/tech/ailef/dbadmin/external/dbmapping/package-info.java b/src/main/java/tech/ailef/dbadmin/external/dbmapping/package-info.java
index 39159b0..692bedf 100644
--- a/src/main/java/tech/ailef/dbadmin/external/dbmapping/package-info.java
+++ b/src/main/java/tech/ailef/dbadmin/external/dbmapping/package-info.java
@@ -1,3 +1,22 @@
+/*
+ * Spring Boot Database Admin - An automatically generated CRUD admin UI for Spring Boot apps
+ * Copyright (C) 2023 Ailef (http://ailef.tech)
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+
 /**
  * Representation of the user database and repository classes.
  */
diff --git a/src/main/java/tech/ailef/dbadmin/external/dto/ValidationErrorsContainer.java b/src/main/java/tech/ailef/dbadmin/external/dto/ValidationErrorsContainer.java
index 5786cb2..89d7ba8 100644
--- a/src/main/java/tech/ailef/dbadmin/external/dto/ValidationErrorsContainer.java
+++ b/src/main/java/tech/ailef/dbadmin/external/dto/ValidationErrorsContainer.java
@@ -1,3 +1,21 @@
+/*
+ * Spring Boot Database Admin - An automatically generated CRUD admin UI for Spring Boot apps
+ * Copyright (C) 2023 Ailef (http://ailef.tech)
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package tech.ailef.dbadmin.external.dto;
 
 import java.util.ArrayList;
diff --git a/src/main/java/tech/ailef/dbadmin/external/dto/package-info.java b/src/main/java/tech/ailef/dbadmin/external/dto/package-info.java
index 1fe52bd..c67061f 100644
--- a/src/main/java/tech/ailef/dbadmin/external/dto/package-info.java
+++ b/src/main/java/tech/ailef/dbadmin/external/dto/package-info.java
@@ -1,3 +1,22 @@
+/*
+ * Spring Boot Database Admin - An automatically generated CRUD admin UI for Spring Boot apps
+ * Copyright (C) 2023 Ailef (http://ailef.tech)
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+
 /**
  * Data objects used in primarily in requests and responses
  */
diff --git a/src/main/java/tech/ailef/dbadmin/external/exceptions/package-info.java b/src/main/java/tech/ailef/dbadmin/external/exceptions/package-info.java
index b692e3e..36af4d2 100644
--- a/src/main/java/tech/ailef/dbadmin/external/exceptions/package-info.java
+++ b/src/main/java/tech/ailef/dbadmin/external/exceptions/package-info.java
@@ -1,3 +1,22 @@
+/*
+ * Spring Boot Database Admin - An automatically generated CRUD admin UI for Spring Boot apps
+ * Copyright (C) 2023 Ailef (http://ailef.tech)
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+
 /**
  * Exception classes
  */
diff --git a/src/main/java/tech/ailef/dbadmin/external/misc/package-info.java b/src/main/java/tech/ailef/dbadmin/external/misc/package-info.java
index e407471..bfdf7f5 100644
--- a/src/main/java/tech/ailef/dbadmin/external/misc/package-info.java
+++ b/src/main/java/tech/ailef/dbadmin/external/misc/package-info.java
@@ -1,3 +1,22 @@
+/*
+ * Spring Boot Database Admin - An automatically generated CRUD admin UI for Spring Boot apps
+ * Copyright (C) 2023 Ailef (http://ailef.tech)
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+
 /**
  * Miscellaneous utility classes.
  */
diff --git a/src/main/java/tech/ailef/dbadmin/external/package-info.java b/src/main/java/tech/ailef/dbadmin/external/package-info.java
index 03c64aa..faedcdf 100644
--- a/src/main/java/tech/ailef/dbadmin/external/package-info.java
+++ b/src/main/java/tech/ailef/dbadmin/external/package-info.java
@@ -1,3 +1,21 @@
+/*
+ * Spring Boot Database Admin - An automatically generated CRUD admin UI for Spring Boot apps
+ * Copyright (C) 2023 Ailef (http://ailef.tech)
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 /**
  * Root package of Spring Boot Database Admin
  */
diff --git a/src/main/java/tech/ailef/dbadmin/internal/model/package-info.java b/src/main/java/tech/ailef/dbadmin/internal/model/package-info.java
index c80b5c6..9cc0793 100644
--- a/src/main/java/tech/ailef/dbadmin/internal/model/package-info.java
+++ b/src/main/java/tech/ailef/dbadmin/internal/model/package-info.java
@@ -1,3 +1,22 @@
+/*
+ * Spring Boot Database Admin - An automatically generated CRUD admin UI for Spring Boot apps
+ * Copyright (C) 2023 Ailef (http://ailef.tech)
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+
 /**
  * Entity classes for the internal data source (action logs and user settings).
  */
diff --git a/src/main/java/tech/ailef/dbadmin/internal/package-info.java b/src/main/java/tech/ailef/dbadmin/internal/package-info.java
index 2b8aaa7..4dbfa3a 100644
--- a/src/main/java/tech/ailef/dbadmin/internal/package-info.java
+++ b/src/main/java/tech/ailef/dbadmin/internal/package-info.java
@@ -1,3 +1,22 @@
+/*
+ * Spring Boot Database Admin - An automatically generated CRUD admin UI for Spring Boot apps
+ * Copyright (C) 2023 Ailef (http://ailef.tech)
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+
 /**
  * This is the root package for the "internal" data source, i.e. not the data source
  * that interacts with the user entities, but rather the one used internally by Spring
diff --git a/src/main/java/tech/ailef/dbadmin/internal/repository/package-info.java b/src/main/java/tech/ailef/dbadmin/internal/repository/package-info.java
index 37db7cf..0748e39 100644
--- a/src/main/java/tech/ailef/dbadmin/internal/repository/package-info.java
+++ b/src/main/java/tech/ailef/dbadmin/internal/repository/package-info.java
@@ -1,3 +1,21 @@
+/*
+ * Spring Boot Database Admin - An automatically generated CRUD admin UI for Spring Boot apps
+ * Copyright (C) 2023 Ailef (http://ailef.tech)
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 /**
  * Repositories for the internal data source.
  */
diff --git a/src/main/java/tech/ailef/dbadmin/internal/service/package-info.java b/src/main/java/tech/ailef/dbadmin/internal/service/package-info.java
index 2639043..358f9e8 100644
--- a/src/main/java/tech/ailef/dbadmin/internal/service/package-info.java
+++ b/src/main/java/tech/ailef/dbadmin/internal/service/package-info.java
@@ -1,3 +1,21 @@
+/*
+ * Spring Boot Database Admin - An automatically generated CRUD admin UI for Spring Boot apps
+ * Copyright (C) 2023 Ailef (http://ailef.tech)
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 /**
  * Service classes for the internal data source.
  */