diff --git a/keyboards/htx_studio/one_handed_keyboard_ml/config.h b/keyboards/htx_studio/one_handed_keyboard_ml/config.h
index 5d5752dbf7f..c2a60b2393c 100644
--- a/keyboards/htx_studio/one_handed_keyboard_ml/config.h
+++ b/keyboards/htx_studio/one_handed_keyboard_ml/config.h
@@ -1,3 +1,19 @@
+/* Copyright 2025 htx-studio (@https://github.com/htx-studio)
+ *
+ * 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 2 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 <http://www.gnu.org/licenses/>.
+ */
+
 #pragma once
 
 #define SPI_DRIVER SPID1
diff --git a/keyboards/htx_studio/one_handed_keyboard_ml/keymaps/default/keymap.c b/keyboards/htx_studio/one_handed_keyboard_ml/keymaps/default/keymap.c
index ac7e61346c2..87d0226435b 100644
--- a/keyboards/htx_studio/one_handed_keyboard_ml/keymaps/default/keymap.c
+++ b/keyboards/htx_studio/one_handed_keyboard_ml/keymaps/default/keymap.c
@@ -1,3 +1,18 @@
+/* Copyright 2025 htx-studio (@https://github.com/htx-studio)
+ *
+ * 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 2 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 <http://www.gnu.org/licenses/>.
+ */
 
 #include QMK_KEYBOARD_H
 
diff --git a/keyboards/htx_studio/one_handed_keyboard_mr/config.h b/keyboards/htx_studio/one_handed_keyboard_mr/config.h
index 4c4d55b7903..16d6192182a 100644
--- a/keyboards/htx_studio/one_handed_keyboard_mr/config.h
+++ b/keyboards/htx_studio/one_handed_keyboard_mr/config.h
@@ -1,3 +1,19 @@
+/* Copyright 2025 htx-studio (@https://github.com/htx-studio)
+ *
+ * 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 2 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 <http://www.gnu.org/licenses/>.
+ */
+
 #pragma once
 
 #define SPI_DRIVER SPID1
diff --git a/keyboards/htx_studio/one_handed_keyboard_mr/keymaps/default/keymap.c b/keyboards/htx_studio/one_handed_keyboard_mr/keymaps/default/keymap.c
index fe52b65318c..5205f78bdf0 100644
--- a/keyboards/htx_studio/one_handed_keyboard_mr/keymaps/default/keymap.c
+++ b/keyboards/htx_studio/one_handed_keyboard_mr/keymaps/default/keymap.c
@@ -1,3 +1,19 @@
+/* Copyright 2025 htx-studio (@https://github.com/htx-studio)
+ *
+ * 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 2 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 <http://www.gnu.org/licenses/>.
+ */
+
 #include QMK_KEYBOARD_H
 
 const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
diff --git a/keyboards/htx_studio/one_handed_keyboard_sl/config.h b/keyboards/htx_studio/one_handed_keyboard_sl/config.h
index 599ab4f298e..822ccdf4461 100644
--- a/keyboards/htx_studio/one_handed_keyboard_sl/config.h
+++ b/keyboards/htx_studio/one_handed_keyboard_sl/config.h
@@ -1,3 +1,19 @@
+/* Copyright 2025 htx-studio (@https://github.com/htx-studio)
+ *
+ * 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 2 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 <http://www.gnu.org/licenses/>.
+ */
+
 #pragma once
 
 #define SPI_DRIVER SPID1
diff --git a/keyboards/htx_studio/one_handed_keyboard_sl/keymaps/default/keymap.c b/keyboards/htx_studio/one_handed_keyboard_sl/keymaps/default/keymap.c
index e1fc913a039..0986deba026 100644
--- a/keyboards/htx_studio/one_handed_keyboard_sl/keymaps/default/keymap.c
+++ b/keyboards/htx_studio/one_handed_keyboard_sl/keymaps/default/keymap.c
@@ -1,3 +1,18 @@
+/* Copyright 2025 htx-studio (@https://github.com/htx-studio)
+ *
+ * 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 2 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 <http://www.gnu.org/licenses/>.
+ */
 
 #include QMK_KEYBOARD_H