diff --git a/require-ess/src/asprintf.c b/require-ess/src/asprintf.c
index 7290e021a7f85f871b4bf16b96535eb8235eb5e5..009028d3f1c233aa4eb3b46dc45ae567c15f6d7b 100644
--- a/require-ess/src/asprintf.c
+++ b/require-ess/src/asprintf.c
@@ -1,3 +1,6 @@
+/* Copyright (C) 2020 Dirk Zimoch */
+/* Copyright (C) 2020-2022 European Spallation Source, ERIC */
+
 #include "asprintf.h"
 #include <stdarg.h>
 #include <stdio.h>
diff --git a/require-ess/src/asprintf.h b/require-ess/src/asprintf.h
index d8c272994b5222e069c9ddd8cc9b7b300383d155..e5b8cabfe6eba6fe27ed4e780f3ec2e7061f5be1 100644
--- a/require-ess/src/asprintf.h
+++ b/require-ess/src/asprintf.h
@@ -1,3 +1,6 @@
+/* Copyright (C) 2020 Dirk Zimoch */
+/* Copyright (C) 2020-2022 European Spallation Source, ERIC */
+
 #pragma once
 
 #ifdef __cplusplus
diff --git a/require-ess/src/expr.c b/require-ess/src/expr.c
index 9ec91aa39892b299182375c154b920f296ec1847..9d10432fa0393ad5bd026b6ce1a345457c2f9284 100644
--- a/require-ess/src/expr.c
+++ b/require-ess/src/expr.c
@@ -1,3 +1,6 @@
+/* Copyright (C) 2020 Dirk Zimoch */
+/* Copyright (C) 2020-2022 European Spallation Source, ERIC */
+
 #include <ctype.h>
 #include <stdio.h>
 #include <stdlib.h>
diff --git a/require-ess/src/expr.h b/require-ess/src/expr.h
index 589e55b6b5413b7a1ff939a8a66747e8ecf20540..8501225ffaf498336ac4fb36f8e5035ce53bce2c 100644
--- a/require-ess/src/expr.h
+++ b/require-ess/src/expr.h
@@ -1,3 +1,6 @@
+/* Copyright (C) 2020 Dirk Zimoch */
+/* Copyright (C) 2020-2022 European Spallation Source, ERIC */
+
 #pragma once
 
 #include <stddef.h>
diff --git a/require-ess/src/require.c b/require-ess/src/require.c
index 42a31d8a261fd413afd73b71004d0b878aeba709..45f50aa39e96d3128dbdf1577e6b40c28658ed42 100644
--- a/require-ess/src/require.c
+++ b/require-ess/src/require.c
@@ -1,3 +1,6 @@
+/* Copyright (C) 2020 Dirk Zimoch */
+/* Copyright (C) 2020-2022 European Spallation Source, ERIC */
+
 /*
  * ld - load code dynamically
  *
diff --git a/require-ess/src/require.h b/require-ess/src/require.h
index 7ab05442c5a554061607bc1436eaa5d61f8e1ea8..e0a82e1e5213a93505db7ce4f91d2a5f10109c0b 100644
--- a/require-ess/src/require.h
+++ b/require-ess/src/require.h
@@ -1,3 +1,6 @@
+/* Copyright (C) 2020 Dirk Zimoch */
+/* Copyright (C) 2020-2022 European Spallation Source, ERIC */
+
 #pragma once
 
 #ifdef __cplusplus
diff --git a/require-ess/src/runScript.c b/require-ess/src/runScript.c
index 191e71d1a14ec141a796bd77e0be50734f86720a..aac016135ec07da060599f395955136beed21043 100644
--- a/require-ess/src/runScript.c
+++ b/require-ess/src/runScript.c
@@ -1,3 +1,6 @@
+/* Copyright (C) 2020 Dirk Zimoch */
+/* Copyright (C) 2020-2022 European Spallation Source, ERIC */
+
 #ifndef _GNU_SOURCE
 #define _GNU_SOURCE
 #endif
diff --git a/require-ess/src/strdup.c b/require-ess/src/strdup.c
index 598c316cc8f9bd8b4f788a165afca864fc48d8a6..5c19581ae55570be6419396108f24736a167ecb5 100644
--- a/require-ess/src/strdup.c
+++ b/require-ess/src/strdup.c
@@ -1,3 +1,6 @@
+/* Copyright (C) 2020 Dirk Zimoch */
+/* Copyright (C) 2020-2022 European Spallation Source, ERIC */
+
 #include <stdlib.h>
 #include <string.h>
 
diff --git a/require-ess/src/strdup.h b/require-ess/src/strdup.h
index be5839b3eb85f5d437365c6dc42129345d1890bb..c2a544cf37d7731a7fa9ac4327dfcb035298a23b 100644
--- a/require-ess/src/strdup.h
+++ b/require-ess/src/strdup.h
@@ -1,3 +1,6 @@
+/* Copyright (C) 2020 Dirk Zimoch */
+/* Copyright (C) 2020-2022 European Spallation Source, ERIC */
+
 #pragma once
 
 #include <stddef.h>
diff --git a/require-ess/src/version.c b/require-ess/src/version.c
index 9a66e9b7e07cb8a5efaa17bcdad6969adb0da33d..60257e7104fe3386d12467901aba09d71101f353 100644
--- a/require-ess/src/version.c
+++ b/require-ess/src/version.c
@@ -1,3 +1,5 @@
+/* Copyright (C) 2020-2022 European Spallation Source, ERIC */
+
 #include "version.h"
 #include <regex.h>
 #include <stdio.h>
diff --git a/require-ess/src/version.h b/require-ess/src/version.h
index a81254feb7e2dd1e333763efff718cb735bb7fac..09e325ad7ff36483e6d13fc2e6799f9b504e5560 100644
--- a/require-ess/src/version.h
+++ b/require-ess/src/version.h
@@ -1,3 +1,5 @@
+/* Copyright (C) 2020-2022 European Spallation Source, ERIC */
+
 #pragma once
 
 typedef struct semver_t {