diff --git a/Makefile b/Makefile
index 734ca3c..c3dbd4a 100644
--- a/Makefile
+++ b/Makefile
@@ -1,3 +1,5 @@
+# Copyright (jacekpoz 2024). Licensed under the EUPL-1.2 or later.
+
 CC = clang
 CFLAGS  = -std=c11 -Wall -Wextra -Wpedantic
 CFLAGS += -fstrict-aliasing
diff --git a/examples/Makefile b/examples/Makefile
index df1c743..b4933a0 100644
--- a/examples/Makefile
+++ b/examples/Makefile
@@ -1,3 +1,5 @@
+# Copyright (jacekpoz 2024). Licensed under the EUPL-1.2 or later.
+
 LDFLAGS = -L$(BIN) -lptk
 
 EXAMPLE_DIR = examples
diff --git a/examples/amogus.c b/examples/amogus.c
index 6f65438..342fb6e 100644
--- a/examples/amogus.c
+++ b/examples/amogus.c
@@ -1,3 +1,5 @@
+// Copyright (jacekpoz 2024). Licensed under the EUPL-1.2 or later.
+
 #include <stdlib.h>
 #include <ptk.h>
 
diff --git a/shaders/shader.frag.glsl b/shaders/shader.frag.glsl
index b53836c..cf5fb02 100644
--- a/shaders/shader.frag.glsl
+++ b/shaders/shader.frag.glsl
@@ -1,3 +1,5 @@
+// Copyright (jacekpoz 2024). Licensed under the EUPL-1.2 or later.
+
 #version 450
 
 layout(constant_id = 0) const int PTK_COMPONENT_TYPE_ELLIPSE = 0;
diff --git a/shaders/shader.vert.glsl b/shaders/shader.vert.glsl
index 692176a..3e61381 100644
--- a/shaders/shader.vert.glsl
+++ b/shaders/shader.vert.glsl
@@ -1,3 +1,5 @@
+// Copyright (jacekpoz 2024). Licensed under the EUPL-1.2 or later.
+
 #version 450
 
 layout(binding = 0) uniform UniformBufferObject {
diff --git a/src/ptk.c b/src/ptk.c
index b9c64cc..a6128bd 100644
--- a/src/ptk.c
+++ b/src/ptk.c
@@ -1,3 +1,5 @@
+// Copyright (jacekpoz 2024). Licensed under the EUPL-1.2 or later.
+
 #include <ptk.h>
 #include <ptk_log.h>
 #include <ptk_list.h>
diff --git a/src/ptk_list.c b/src/ptk_list.c
index 9af5b15..0af1f5d 100644
--- a/src/ptk_list.c
+++ b/src/ptk_list.c
@@ -1,3 +1,5 @@
+// Copyright (jacekpoz 2024). Licensed under the EUPL-1.2 or later.
+
 #include <ptk_list.h>
 
 #include <errno.h>
diff --git a/src/ptk_list.h b/src/ptk_list.h
index 9fde387..303bf48 100644
--- a/src/ptk_list.h
+++ b/src/ptk_list.h
@@ -1,3 +1,5 @@
+// Copyright (jacekpoz 2024). Licensed under the EUPL-1.2 or later.
+
 #ifndef PTK_PTK_LIST_H_
 #define PTK_PTK_LIST_H_
 
diff --git a/src/ptk_log.c b/src/ptk_log.c
index 23565de..5c34fbe 100644
--- a/src/ptk_log.c
+++ b/src/ptk_log.c
@@ -1,3 +1,5 @@
+// Copyright (jacekpoz 2024). Licensed under the EUPL-1.2 or later.
+
 #include <ptk_log.h>
 
 #include <stdio.h>
diff --git a/src/ptk_option.h b/src/ptk_option.h
index 1e42389..4b35eb0 100644
--- a/src/ptk_option.h
+++ b/src/ptk_option.h
@@ -1,3 +1,5 @@
+// Copyright (jacekpoz 2024). Licensed under the EUPL-1.2 or later.
+
 #ifndef PTK_PTK_OPTION_H_
 #define PTK_PTK_OPTION_H_
 
diff --git a/src/ptk_vk/components.c b/src/ptk_vk/components.c
index 519a564..2c7422c 100644
--- a/src/ptk_vk/components.c
+++ b/src/ptk_vk/components.c
@@ -1,3 +1,5 @@
+// Copyright (jacekpoz 2024). Licensed under the EUPL-1.2 or later.
+
 #include <ptk.h>
 #include <ptk_vk/components.h>
 #include <ptk_vk/init.h>
diff --git a/src/ptk_vk/components.h b/src/ptk_vk/components.h
index 2f0430d..74c8944 100644
--- a/src/ptk_vk/components.h
+++ b/src/ptk_vk/components.h
@@ -1,3 +1,5 @@
+// Copyright (jacekpoz 2024). Licensed under the EUPL-1.2 or later.
+
 #ifndef PTK_PTK_VK_COMPONENTS_H_
 #define PTK_PTK_VK_COMPONENTS_H_
 
diff --git a/src/ptk_vk/draw.c b/src/ptk_vk/draw.c
index ca8c4fc..6ea0907 100644
--- a/src/ptk_vk/draw.c
+++ b/src/ptk_vk/draw.c
@@ -1,3 +1,5 @@
+// Copyright (jacekpoz 2024). Licensed under the EUPL-1.2 or later.
+
 #include <ptk_vk/draw.h>
 
 #include <ptk_vk/init.h>
diff --git a/src/ptk_vk/draw.h b/src/ptk_vk/draw.h
index f1f824e..2fcc99a 100644
--- a/src/ptk_vk/draw.h
+++ b/src/ptk_vk/draw.h
@@ -1,3 +1,5 @@
+// Copyright (jacekpoz 2024). Licensed under the EUPL-1.2 or later.
+
 #ifndef PTK_PTK_VK_DRAW_H_
 #define PTK_PTK_VK_DRAW_H_
 
diff --git a/src/ptk_vk/init.c b/src/ptk_vk/init.c
index b645d9e..103d280 100644
--- a/src/ptk_vk/init.c
+++ b/src/ptk_vk/init.c
@@ -1,3 +1,5 @@
+// Copyright (jacekpoz 2024). Licensed under the EUPL-1.2 or later.
+
 #include <ptk_vk/init.h>
 
 #include <ptk_vk/components.h>
diff --git a/src/ptk_vk/init.h b/src/ptk_vk/init.h
index 3e3844a..d685a33 100644
--- a/src/ptk_vk/init.h
+++ b/src/ptk_vk/init.h
@@ -1,3 +1,5 @@
+// Copyright (jacekpoz 2024). Licensed under the EUPL-1.2 or later.
+
 #ifndef PTK_PTK_VK_INIT_H_
 #define PTK_PTK_VK_INIT_H_
 
diff --git a/src/ptk_vk/utils.c b/src/ptk_vk/utils.c
index 1a2c442..960e44d 100644
--- a/src/ptk_vk/utils.c
+++ b/src/ptk_vk/utils.c
@@ -1,3 +1,5 @@
+// Copyright (jacekpoz 2024). Licensed under the EUPL-1.2 or later.
+
 #include <ptk_vk/utils.h>
 
 const char *vk_result_string(VkResult res) {
diff --git a/src/ptk_vk/utils.h b/src/ptk_vk/utils.h
index b2a7836..7bf2005 100644
--- a/src/ptk_vk/utils.h
+++ b/src/ptk_vk/utils.h
@@ -1,3 +1,5 @@
+// Copyright (jacekpoz 2024). Licensed under the EUPL-1.2 or later.
+
 #ifndef PTK_PTK_VK_UTILS_H_
 #define PTK_PTK_VK_UTILS_H_
 
diff --git a/test/Makefile b/test/Makefile
index 6e3c11b..3dd86e0 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -1,3 +1,5 @@
+# Copyright (jacekpoz 2024). Licensed under the EUPL-1.2 or later.
+
 INCLUDE += test
 CFLAGS += $(addprefix -I, $(INCLUDE))
 LDFLAGS = -L$(BIN) -lptk
diff --git a/test/list.c b/test/list.c
index c7152a8..afecc53 100644
--- a/test/list.c
+++ b/test/list.c
@@ -1,3 +1,5 @@
+// Copyright (jacekpoz 2024). Licensed under the EUPL-1.2 or later.
+
 #include <test.h>
 #include <ptk_list.h>
 
diff --git a/test/test.h b/test/test.h
index 9a192a8..17593e1 100644
--- a/test/test.h
+++ b/test/test.h
@@ -1,3 +1,5 @@
+// Copyright (jacekpoz 2024). Licensed under the EUPL-1.2 or later.
+
 #ifndef TEST_TEST_H_
 #define TEST_TEST_H_