diff --git a/src/dummy/i_cdmus.c b/src/dummy/i_cdmus.c
index 94b8fa30e..eaf11066e 100644
--- a/src/dummy/i_cdmus.c
+++ b/src/dummy/i_cdmus.c
@@ -1,3 +1,15 @@
+// DR. ROBOTNIK'S RING RACERS
+//-----------------------------------------------------------------------------
+// Copyright (C) 2024 by Kart Krew.
+// Copyright (C) 2020 by Sonic Team Junior.
+// Copyright (C) 2000 by DooM Legacy Team.
+// Copyright (C) 1996 by id Software, Inc.
+//
+// This program is free software distributed under the
+// terms of the GNU General Public License, version 2.
+// See the 'LICENSE' file for more details.
+//-----------------------------------------------------------------------------
+
 #include "../command.h"
 #include "../s_sound.h"
 #include "../i_sound.h"
diff --git a/src/dummy/i_main.c b/src/dummy/i_main.c
index 0abf53b17..b1ed14fab 100644
--- a/src/dummy/i_main.c
+++ b/src/dummy/i_main.c
@@ -1,3 +1,15 @@
+// DR. ROBOTNIK'S RING RACERS
+//-----------------------------------------------------------------------------
+// Copyright (C) 2024 by Kart Krew.
+// Copyright (C) 2020 by Sonic Team Junior.
+// Copyright (C) 2000 by DooM Legacy Team.
+// Copyright (C) 1996 by id Software, Inc.
+//
+// This program is free software distributed under the
+// terms of the GNU General Public License, version 2.
+// See the 'LICENSE' file for more details.
+//-----------------------------------------------------------------------------
+
 #include "../doomdef.h"
 #include "../d_main.h"
 #include "../m_argv.h"
diff --git a/src/dummy/i_net.c b/src/dummy/i_net.c
index f6e642022..cecb6697c 100644
--- a/src/dummy/i_net.c
+++ b/src/dummy/i_net.c
@@ -1,3 +1,15 @@
+// DR. ROBOTNIK'S RING RACERS
+//-----------------------------------------------------------------------------
+// Copyright (C) 2024 by Kart Krew.
+// Copyright (C) 2020 by Sonic Team Junior.
+// Copyright (C) 2000 by DooM Legacy Team.
+// Copyright (C) 1996 by id Software, Inc.
+//
+// This program is free software distributed under the
+// terms of the GNU General Public License, version 2.
+// See the 'LICENSE' file for more details.
+//-----------------------------------------------------------------------------
+
 #include "../i_net.h"
 
 boolean I_InitNetwork(void)
diff --git a/src/dummy/i_sound.c b/src/dummy/i_sound.c
index ba0fc6423..308d78f56 100644
--- a/src/dummy/i_sound.c
+++ b/src/dummy/i_sound.c
@@ -1,3 +1,15 @@
+// DR. ROBOTNIK'S RING RACERS
+//-----------------------------------------------------------------------------
+// Copyright (C) 2024 by Kart Krew.
+// Copyright (C) 2020 by Sonic Team Junior.
+// Copyright (C) 2000 by DooM Legacy Team.
+// Copyright (C) 1996 by id Software, Inc.
+//
+// This program is free software distributed under the
+// terms of the GNU General Public License, version 2.
+// See the 'LICENSE' file for more details.
+//-----------------------------------------------------------------------------
+
 #include "../i_sound.h"
 
 UINT8 sound_started = 0;
diff --git a/src/dummy/i_system.c b/src/dummy/i_system.c
index 3af36c983..519fac44a 100644
--- a/src/dummy/i_system.c
+++ b/src/dummy/i_system.c
@@ -1,3 +1,15 @@
+// DR. ROBOTNIK'S RING RACERS
+//-----------------------------------------------------------------------------
+// Copyright (C) 2024 by Kart Krew.
+// Copyright (C) 2020 by Sonic Team Junior.
+// Copyright (C) 2000 by DooM Legacy Team.
+// Copyright (C) 1996 by id Software, Inc.
+//
+// This program is free software distributed under the
+// terms of the GNU General Public License, version 2.
+// See the 'LICENSE' file for more details.
+//-----------------------------------------------------------------------------
+
 #include "../doomdef.h"
 #include "../doomtype.h"
 #include "../i_system.h"
diff --git a/src/dummy/i_video.c b/src/dummy/i_video.c
index 3b0a12a32..171304818 100644
--- a/src/dummy/i_video.c
+++ b/src/dummy/i_video.c
@@ -1,3 +1,15 @@
+// DR. ROBOTNIK'S RING RACERS
+//-----------------------------------------------------------------------------
+// Copyright (C) 2024 by Kart Krew.
+// Copyright (C) 2020 by Sonic Team Junior.
+// Copyright (C) 2000 by DooM Legacy Team.
+// Copyright (C) 1996 by id Software, Inc.
+//
+// This program is free software distributed under the
+// terms of the GNU General Public License, version 2.
+// See the 'LICENSE' file for more details.
+//-----------------------------------------------------------------------------
+
 #include "../doomdef.h"
 #include "../command.h"
 #include "../i_video.h"