diff --git a/interpreter/php/decode_amd64.c b/interpreter/php/decode_amd64.c
index c207d084..d58a861b 100644
--- a/interpreter/php/decode_amd64.c
+++ b/interpreter/php/decode_amd64.c
@@ -1,3 +1,9 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Apache License 2.0.
+ * See the file "LICENSE" for details.
+ */
+
 //go:build amd64
 #include <Zydis/Zydis.h>
 #include "decode_amd64.h"
diff --git a/interpreter/php/decode_amd64.h b/interpreter/php/decode_amd64.h
index ad5ad0e1..5a0c1b8b 100644
--- a/interpreter/php/decode_amd64.h
+++ b/interpreter/php/decode_amd64.h
@@ -1,3 +1,9 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Apache License 2.0.
+ * See the file "LICENSE" for details.
+ */
+
 //go:build amd64
 #ifndef __INCLUDED_PHP_DECODE_X86_64__
 #define __INCLUDED_PHP_DECODE_X86_64__
diff --git a/interpreter/python/decode_amd64.c b/interpreter/python/decode_amd64.c
index f834fa01..fe88b551 100644
--- a/interpreter/python/decode_amd64.c
+++ b/interpreter/python/decode_amd64.c
@@ -1,3 +1,9 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Apache License 2.0.
+ * See the file "LICENSE" for details.
+ */
+
 //go:build amd64
 
 #include <Zydis/Zydis.h>
diff --git a/interpreter/python/decode_amd64.h b/interpreter/python/decode_amd64.h
index f5ad7ca4..bda06a4b 100644
--- a/interpreter/python/decode_amd64.h
+++ b/interpreter/python/decode_amd64.h
@@ -1,3 +1,9 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Apache License 2.0.
+ * See the file "LICENSE" for details.
+ */
+
 //go:build amd64
 
 #ifndef __PYTHON_DECODE_X86_64__
diff --git a/libpf/pfelf/testdata/fixed-address.c b/libpf/pfelf/testdata/fixed-address.c
index ba6acb8c..18ee130a 100644
--- a/libpf/pfelf/testdata/fixed-address.c
+++ b/libpf/pfelf/testdata/fixed-address.c
@@ -1,3 +1,9 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Apache License 2.0.
+ * See the file "LICENSE" for details.
+ */
+
 __attribute__((section(".coffee_section")))
 int function_at_fixed_address(void) {
     return 0;
diff --git a/libpf/pfelf/testdata/test.c b/libpf/pfelf/testdata/test.c
index fc2b6e0b..156d92c3 100644
--- a/libpf/pfelf/testdata/test.c
+++ b/libpf/pfelf/testdata/test.c
@@ -1,3 +1,9 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Apache License 2.0.
+ * See the file "LICENSE" for details.
+ */
+
 #ifndef LINUX_VERSION
 #define LINUX_VERSION ""
 #endif
diff --git a/reporter/testdata/test.c b/reporter/testdata/test.c
index 43ba4dc4..34356f9f 100644
--- a/reporter/testdata/test.c
+++ b/reporter/testdata/test.c
@@ -1,3 +1,9 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Apache License 2.0.
+ * See the file "LICENSE" for details.
+ */
+
 #include <unistd.h>
 
 int main(int argc, char *argv[]) {
diff --git a/tpbase/fsbase_decode_amd64.c b/tpbase/fsbase_decode_amd64.c
index 3a589597..bd713675 100644
--- a/tpbase/fsbase_decode_amd64.c
+++ b/tpbase/fsbase_decode_amd64.c
@@ -1,3 +1,9 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Apache License 2.0.
+ * See the file "LICENSE" for details.
+ */
+
 //go:build amd64
 
 #include <Zydis/Zydis.h>
diff --git a/tpbase/fsbase_decode_amd64.h b/tpbase/fsbase_decode_amd64.h
index 5208cf2c..2a488ec9 100644
--- a/tpbase/fsbase_decode_amd64.h
+++ b/tpbase/fsbase_decode_amd64.h
@@ -1,3 +1,9 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Apache License 2.0.
+ * See the file "LICENSE" for details.
+ */
+
 //go:build amd64
 
 #ifndef __FSBASE_DECODE_X86_64__
diff --git a/tpbase/libc_decode_amd64.c b/tpbase/libc_decode_amd64.c
index c1d88a4c..e1248d01 100644
--- a/tpbase/libc_decode_amd64.c
+++ b/tpbase/libc_decode_amd64.c
@@ -1,3 +1,9 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Apache License 2.0.
+ * See the file "LICENSE" for details.
+ */
+
 //go:build amd64
 
 #include <Zydis/Zydis.h>
diff --git a/tpbase/libc_decode_amd64.h b/tpbase/libc_decode_amd64.h
index 3d7452b5..5dab6847 100644
--- a/tpbase/libc_decode_amd64.h
+++ b/tpbase/libc_decode_amd64.h
@@ -1,3 +1,9 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Apache License 2.0.
+ * See the file "LICENSE" for details.
+ */
+
 //go:build amd64
 
 #ifndef LIBC_DECODE_X86_64
diff --git a/utils/coredump/testsources/c/brokenstack.c b/utils/coredump/testsources/c/brokenstack.c
index 2e71da79..6afd560e 100644
--- a/utils/coredump/testsources/c/brokenstack.c
+++ b/utils/coredump/testsources/c/brokenstack.c
@@ -1,3 +1,9 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Apache License 2.0.
+ * See the file "LICENSE" for details.
+ */
+
 // Example application that intentionally breaks its stack.
 // 
 // cc -O2 -g -o brokenstack brokenstack.c
diff --git a/utils/coredump/testsources/c/sig.c b/utils/coredump/testsources/c/sig.c
index 5a5f4e2e..f39a4311 100644
--- a/utils/coredump/testsources/c/sig.c
+++ b/utils/coredump/testsources/c/sig.c
@@ -1,3 +1,9 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Apache License 2.0.
+ * See the file "LICENSE" for details.
+ */
+
 #include<stdio.h>
 #include<signal.h>
 #include<unistd.h>
diff --git a/utils/coredump/testsources/c/stackalign.c b/utils/coredump/testsources/c/stackalign.c
index ea514f27..c6118110 100644
--- a/utils/coredump/testsources/c/stackalign.c
+++ b/utils/coredump/testsources/c/stackalign.c
@@ -1,3 +1,9 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Apache License 2.0.
+ * See the file "LICENSE" for details.
+ */
+
 // gcc -O3 -fomit-frame-pointer -mavx -ftree-vectorize stackalign.c -o stackalign
 
 #include <unistd.h>