diff --git a/agent/build.rs b/agent/build.rs
index 166bd28..2d24572 100644
--- a/agent/build.rs
+++ b/agent/build.rs
@@ -1,4 +1,5 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Copyright (C) 2023 The crypto-auditing developers.
 
 use libbpf_cargo::SkeletonBuilder;
 use std::{
diff --git a/agent/src/bpf/audit.bpf.c b/agent/src/bpf/audit.bpf.c
index a0e568e..a6b12b9 100644
--- a/agent/src/bpf/audit.bpf.c
+++ b/agent/src/bpf/audit.bpf.c
@@ -1,4 +1,5 @@
-/* SPDX-License-Identifier: GPL-2.0 */
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* Copyright (C) 2022-2023 The crypto-auditing developers. */
 
 #include "vmlinux.h"
 #include <bpf/bpf_core_read.h>
diff --git a/agent/tests/agenttest/build.rs b/agent/tests/agenttest/build.rs
index b1caf7a..7eec26c 100644
--- a/agent/tests/agenttest/build.rs
+++ b/agent/tests/agenttest/build.rs
@@ -1,4 +1,5 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Copyright (C) 2023 The crypto-auditing developers.
 
 use libbpf_cargo::SkeletonBuilder;
 use std::{
diff --git a/agent/tests/agenttest/src/bpf/agent.bpf.c b/agent/tests/agenttest/src/bpf/agent.bpf.c
index 23580e0..bf0d833 100644
--- a/agent/tests/agenttest/src/bpf/agent.bpf.c
+++ b/agent/tests/agenttest/src/bpf/agent.bpf.c
@@ -1,4 +1,5 @@
-/* SPDX-License-Identifier: GPL-2.0 */
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* Copyright (C) 2023 The crypto-auditing developers. */
 
 #include "vmlinux.h"
 #include <bpf/usdt.bpf.h>
diff --git a/crypto-auditing/build.rs b/crypto-auditing/build.rs
index d23bccb..4519735 100644
--- a/crypto-auditing/build.rs
+++ b/crypto-auditing/build.rs
@@ -1,4 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2023 The crypto-auditing developers.
 
 use std::{env, path::PathBuf};
 
diff --git a/crypto-auditing/src/bpf/audit.h b/crypto-auditing/src/bpf/audit.h
index 84432bc..3ae0c59 100644
--- a/crypto-auditing/src/bpf/audit.h
+++ b/crypto-auditing/src/bpf/audit.h
@@ -1,4 +1,5 @@
-/* SPDX-License-Identifier: GPL-2.0 */
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* Copyright (C) 2023 The crypto-auditing developers. */
 
 /* This file should be self-contained and do not rely on any system
  * headers, because it is used by both the BPF program (audit.bpf.c)