diff --git a/examples/headers.zig b/examples/headers.zig
index f30972c..c86f5a9 100644
--- a/examples/headers.zig
+++ b/examples/headers.zig
@@ -1,3 +1,6 @@
+// This file is licensed under the CC0 1.0 license.
+// See: https://creativecommons.org/publicdomain/zero/1.0/legalcode
+
 const std = @import("std");
 const nats = @import("nats");
 
diff --git a/examples/pub_bytes.zig b/examples/pub_bytes.zig
index c176d35..19b6345 100644
--- a/examples/pub_bytes.zig
+++ b/examples/pub_bytes.zig
@@ -1,3 +1,6 @@
+// This file is licensed under the CC0 1.0 license.
+// See: https://creativecommons.org/publicdomain/zero/1.0/legalcode
+
 const std = @import("std");
 const nats = @import("nats");
 
diff --git a/examples/request_reply.zig b/examples/request_reply.zig
index 7a1086b..1f167cf 100644
--- a/examples/request_reply.zig
+++ b/examples/request_reply.zig
@@ -1,3 +1,6 @@
+// This file is licensed under the CC0 1.0 license.
+// See: https://creativecommons.org/publicdomain/zero/1.0/legalcode
+
 const std = @import("std");
 const nats = @import("nats");
 
diff --git a/src/connection.zig b/src/connection.zig
index e881a09..b77655e 100644
--- a/src/connection.zig
+++ b/src/connection.zig
@@ -1,3 +1,17 @@
+// Copyright 2023 torque@epicyclic.dev
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 const std = @import("std");
 
 pub const nats_c = @cImport({
diff --git a/src/error.zig b/src/error.zig
index 2ad8c58..cd508c9 100644
--- a/src/error.zig
+++ b/src/error.zig
@@ -1,3 +1,17 @@
+// Copyright 2023 torque@epicyclic.dev
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 const std = @import("std");
 
 pub const nats_c = @cImport({
diff --git a/src/message.zig b/src/message.zig
index c604745..c7a3f79 100644
--- a/src/message.zig
+++ b/src/message.zig
@@ -1,3 +1,17 @@
+// Copyright 2023 torque@epicyclic.dev
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 const std = @import("std");
 
 pub const nats_c = @cImport({
diff --git a/src/statistics.zig b/src/statistics.zig
index 136c951..262b652 100644
--- a/src/statistics.zig
+++ b/src/statistics.zig
@@ -1,3 +1,17 @@
+// Copyright 2023 torque@epicyclic.dev
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 const std = @import("std");
 
 const nats_c = @cImport({
diff --git a/src/subscription.zig b/src/subscription.zig
index 2d9b415..15c165e 100644
--- a/src/subscription.zig
+++ b/src/subscription.zig
@@ -1,3 +1,17 @@
+// Copyright 2023 torque@epicyclic.dev
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 const std = @import("std");
 
 pub const nats_c = @cImport({
diff --git a/src/thunk.zig b/src/thunk.zig
index 2ceb0ad..d430077 100644
--- a/src/thunk.zig
+++ b/src/thunk.zig
@@ -1,3 +1,17 @@
+// Copyright 2023 torque@epicyclic.dev
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 const std = @import("std");
 
 pub const nats_c = @cImport({
diff --git a/tests/connection.zig b/tests/connection.zig
index 107a72f..629bad2 100644
--- a/tests/connection.zig
+++ b/tests/connection.zig
@@ -1,3 +1,6 @@
+// This file is licensed under the CC0 1.0 license.
+// See: https://creativecommons.org/publicdomain/zero/1.0/legalcode
+
 const std = @import("std");
 
 const nats = @import("nats");
diff --git a/tests/main.zig b/tests/main.zig
index a219ae8..34f0ed4 100644
--- a/tests/main.zig
+++ b/tests/main.zig
@@ -1,3 +1,6 @@
+// This file is licensed under the CC0 1.0 license.
+// See: https://creativecommons.org/publicdomain/zero/1.0/legalcode
+
 test {
     _ = @import("./nats.zig");
     _ = @import("./connection.zig");
diff --git a/tests/message.zig b/tests/message.zig
index 284764e..c76cc87 100644
--- a/tests/message.zig
+++ b/tests/message.zig
@@ -1,3 +1,6 @@
+// This file is licensed under the CC0 1.0 license.
+// See: https://creativecommons.org/publicdomain/zero/1.0/legalcode
+
 const std = @import("std");
 
 const nats = @import("nats");
diff --git a/tests/nats.zig b/tests/nats.zig
index 2455116..7407c60 100644
--- a/tests/nats.zig
+++ b/tests/nats.zig
@@ -1,3 +1,6 @@
+// This file is licensed under the CC0 1.0 license.
+// See: https://creativecommons.org/publicdomain/zero/1.0/legalcode
+
 const std = @import("std");
 
 const nats = @import("nats");
diff --git a/tests/util.zig b/tests/util.zig
index 11ff15f..68e9306 100644
--- a/tests/util.zig
+++ b/tests/util.zig
@@ -1,3 +1,6 @@
+// This file is licensed under the CC0 1.0 license.
+// See: https://creativecommons.org/publicdomain/zero/1.0/legalcode
+
 const std = @import("std");
 
 const TestLaunchError = error{