diff --git a/.envrc b/.envrc
index 2ea806a..abcaa70 100644
--- a/.envrc
+++ b/.envrc
@@ -1,3 +1,6 @@
+# Copyright 2023 Uber Technologies, Inc.
+# Licensed under the Apache License, Version 2.0
+
 set -eu
 
 BIN_DIR="$(git rev-parse --show-toplevel)/bin"
diff --git a/BUILD b/BUILD
index 452c016..18333cd 100644
--- a/BUILD
+++ b/BUILD
@@ -1,3 +1,6 @@
+# Copyright 2023 Uber Technologies, Inc.
+# Licensed under the Apache License, Version 2.0
+
 load("@bazel_gazelle//:def.bzl", "gazelle")
 
 # gazelle:map_kind go_binary go_binary //rules:rules_go.bzl
diff --git a/LICENSE b/LICENSE
index e650850..99935c3 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,19 +1,222 @@
-Copyright 2021-2022 bazel-zig-cc contributors
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
 
-Permission is hereby granted, free of charge, to any person obtaining a copy of
-this software and associated documentation files (the "Software"), to deal in
-the Software without restriction, including without limitation the rights to
-use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
-of the Software, and to permit persons to whom the Software is furnished to do
-so, subject to the following conditions:
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
 
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
+   1. Definitions.
 
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
+      publicly display, publicly perform, sublicense, and distribute the
+      Work and such Derivative Works in Source or Object form.
+
+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
+      use, offer to sell, sell, import, and otherwise transfer the Work,
+      where such license applies only to those patent claims licensable
+      by such Contributor that are necessarily infringed by their
+      Contribution(s) alone or by combination of their Contribution(s)
+      with the Work to which such Contribution(s) was submitted. If You
+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
+      modifications, and in Source or Object form, provided that You
+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
+          attribution notices from the Source form of the Work,
+          excluding those notices that do not pertain to any part of
+          the Derivative Works; and
+
+      (d) If the Work includes a "NOTICE" text file as part of its
+          distribution, then any Derivative Works that You distribute must
+          include a readable copy of the attribution notices contained
+          within such NOTICE file, excluding those notices that do not
+          pertain to any part of the Derivative Works, in at least one
+          of the following places: within a NOTICE text file distributed
+          as part of the Derivative Works; within the Source form or
+          documentation, if provided along with the Derivative Works; or,
+          within a display generated by the Derivative Works, if and
+          wherever such third-party notices normally appear. The contents
+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
+          as modifying the License.
+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
+      replaced with your own identifying information. (Don't include
+      the brackets!)  The text should be enclosed in the appropriate
+      comment syntax for the file format. We also recommend that a
+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
+      identification within third-party archives.
+
+Portions Copyright 2022-23 Uber Technologies, Inc.
+Portions Copyright 2022 bazel-zig-cc contributors
+
+   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.
+
+Portions Copyright 2021 Adam Bouhenguel
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to
+   deal in the Software without restriction, including without limitation the
+   rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+   sell copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+   IN THE SOFTWARE.
diff --git a/NOTICE b/NOTICE
new file mode 100644
index 0000000..93fe914
--- /dev/null
+++ b/NOTICE
@@ -0,0 +1,8 @@
+bazel-zig-cc
+
+Originally from development at https://github.com/ajbouh/bazel-zig-cc
+Copyright 2021 Adam Bouhenguel and licensed under the MIT license
+
+Portions of the code
+Copyright 2023 Uber Technologies, Inc. and by the bazel-zig-cc authors
+originally licensed under MIT. License changed to Apache 2.0 as of v1.0.1
diff --git a/bin/mod-tidy b/bin/mod-tidy
index 77c279c..cc1b12a 100755
--- a/bin/mod-tidy
+++ b/bin/mod-tidy
@@ -1,4 +1,7 @@
 #!/bin/sh
+
+# Copyright 2023 Uber Technologies, Inc.
+# Licensed under the Apache License, Version 2.0
 set -eu
 
 cd "$(git rev-parse --show-toplevel)/"
diff --git a/ci/launcher b/ci/launcher
index 53f14aa..90e8f3f 100755
--- a/ci/launcher
+++ b/ci/launcher
@@ -1,4 +1,8 @@
 #!/usr/bin/env bash
+
+# Copyright 2023 Uber Technologies, Inc.
+# Licensed under the Apache License, Version 2.0
+
 set -xeuo pipefail
 
 ZIG=${ZIG:-$(bazel run "$@" --run_under=echo @zig_sdk//:zig)}
diff --git a/ci/lint b/ci/lint
index 7bea3fc..6d4f7b3 100755
--- a/ci/lint
+++ b/ci/lint
@@ -1,4 +1,8 @@
 #!/usr/bin/env bash
+
+# Copyright 2023 Uber Technologies, Inc.
+# Licensed under the Apache License, Version 2.0
+
 set -euo pipefail
 
 cd "$(git rev-parse --show-toplevel)"
diff --git a/ci/list_toolchains_platforms b/ci/list_toolchains_platforms
index fae9ab8..a31bba1 100755
--- a/ci/list_toolchains_platforms
+++ b/ci/list_toolchains_platforms
@@ -1,4 +1,8 @@
 #!/usr/bin/env bash
+
+# Copyright 2023 Uber Technologies, Inc.
+# Licensed under the Apache License, Version 2.0
+
 set -euo pipefail
 
 indent() { sed 's/^/    /'; }
diff --git a/ci/release b/ci/release
index b166828..2d2a2f0 100755
--- a/ci/release
+++ b/ci/release
@@ -1,4 +1,8 @@
 #!/usr/bin/env bash
+
+# Copyright 2023 Uber Technologies, Inc.
+# Licensed under the Apache License, Version 2.0
+
 set -xeuo pipefail
 
 cd "$(git rev-parse --show-toplevel)"
diff --git a/ci/test b/ci/test
index 5efb5b2..47a150d 100755
--- a/ci/test
+++ b/ci/test
@@ -1,4 +1,8 @@
 #!/usr/bin/env bash
+
+# Copyright 2023 Uber Technologies, Inc.
+# Licensed under the Apache License, Version 2.0
+
 set -xeuo pipefail
 
 BAZEL_ZIG_CC_CACHE_PREFIX=${BAZEL_ZIG_CC_CACHE_PREFIX:-/tmp/bazel-zig-cc}
diff --git a/release b/release
index d49de26..81e1e05 100755
--- a/release
+++ b/release
@@ -1,4 +1,8 @@
 #!/usr/bin/env bash
+
+# Copyright 2023 Uber Technologies, Inc.
+# Licensed under the Apache License, Version 2.0
+
 set -xeuo pipefail
 
 sign=(-u motiejus@jakstys.lt)
diff --git a/relnotes.awk b/relnotes.awk
index 3ac8a2f..06c6435 100755
--- a/relnotes.awk
+++ b/relnotes.awk
@@ -1,5 +1,8 @@
 #!/usr/bin/awk -f
 
+# Copyright 2023 Uber Technologies, Inc.
+# Licensed under the Apache License, Version 2.0
+
 BEGIN {stage=0};
 
 !/```/ && stage==0 {
diff --git a/repositories.bzl b/repositories.bzl
index 8f9b41c..f5df8b8 100644
--- a/repositories.bzl
+++ b/repositories.bzl
@@ -1,2 +1,5 @@
+# Copyright 2023 Uber Technologies, Inc.
+# Licensed under the Apache License, Version 2.0
+
 def go_repositories():
     pass
diff --git a/rules/BUILD b/rules/BUILD
index 9544ff7..9e84184 100644
--- a/rules/BUILD
+++ b/rules/BUILD
@@ -1 +1,4 @@
+# Copyright 2023 Uber Technologies, Inc.
+# Licensed under the Apache License, Version 2.0
+
 package(default_visibility = ["//test:__pkg__"])
diff --git a/rules/platform.bzl b/rules/platform.bzl
index d179cc4..a25325d 100644
--- a/rules/platform.bzl
+++ b/rules/platform.bzl
@@ -1,3 +1,6 @@
+# Copyright 2023 Uber Technologies, Inc.
+# Licensed under the Apache License, Version 2.0
+
 def _vars_script(env, run_under, cmd):
     ret = ["#!/bin/sh"]
     for k, v in env.items():
diff --git a/rules/rules_go.bzl b/rules/rules_go.bzl
index f4d860a..b200374 100644
--- a/rules/rules_go.bzl
+++ b/rules/rules_go.bzl
@@ -1,3 +1,6 @@
+# Copyright 2023 Uber Technologies, Inc.
+# Licensed under the Apache License, Version 2.0
+
 load("@io_bazel_rules_go//go:def.bzl", go_binary_rule = "go_binary")
 
 """
diff --git a/test/c/main.c b/test/c/main.c
index 9570a6c..803e9d6 100644
--- a/test/c/main.c
+++ b/test/c/main.c
@@ -1,3 +1,6 @@
+// Copyright 2023 Uber Technologies, Inc.
+// Licensed under the Apache License, Version 2.0
+
 #include <stdio.h>
 #include <features.h>
 
diff --git a/test/c/test.sh b/test/c/test.sh
index c451e10..f51daff 100755
--- a/test/c/test.sh
+++ b/test/c/test.sh
@@ -1,4 +1,8 @@
 #!/bin/sh
+
+# Copyright 2023 Uber Technologies, Inc.
+# Licensed under the Apache License, Version 2.0
+
 set -eu
 
 # shellcheck disable=SC2153
diff --git a/test/cgo/BUILD b/test/cgo/BUILD
index a65c350..3fe4f09 100644
--- a/test/cgo/BUILD
+++ b/test/cgo/BUILD
@@ -1,3 +1,6 @@
+# Copyright 2023 Uber Technologies, Inc.
+# Licensed under the Apache License, Version 2.0
+
 load("@io_bazel_rules_go//go:def.bzl", "go_library", "go_test")
 load("//rules:rules_go.bzl", "go_binary")
 load("@bazel-zig-cc//rules:platform.bzl", "platform_binary", "platform_test")
diff --git a/test/cgo/cgo.go b/test/cgo/cgo.go
index 5c654f8..ed3f1fd 100644
--- a/test/cgo/cgo.go
+++ b/test/cgo/cgo.go
@@ -1,3 +1,6 @@
+// Copyright 2023 Uber Technologies, Inc.
+// Licensed under the Apache License, Version 2.0
+
 package main
 
 // #include <stdio.h>
diff --git a/test/cgo/cgo_test.go b/test/cgo/cgo_test.go
index 75978f3..cb0624f 100644
--- a/test/cgo/cgo_test.go
+++ b/test/cgo/cgo_test.go
@@ -1,3 +1,6 @@
+// Copyright 2023 Uber Technologies, Inc.
+// Licensed under the Apache License, Version 2.0
+
 package main
 
 import (
diff --git a/test/glibc_hacks/BUILD b/test/glibc_hacks/BUILD
index 4b458a9..28b014e 100644
--- a/test/glibc_hacks/BUILD
+++ b/test/glibc_hacks/BUILD
@@ -1,3 +1,6 @@
+# Copyright 2023 Uber Technologies, Inc.
+# Licensed under the Apache License, Version 2.0
+
 load("@bazel-zig-cc//rules:platform.bzl", "platform_binary")
 
 cc_binary(
diff --git a/test/glibc_hacks/main.c b/test/glibc_hacks/main.c
index fd86b36..bf2de42 100644
--- a/test/glibc_hacks/main.c
+++ b/test/glibc_hacks/main.c
@@ -1,3 +1,6 @@
+// Copyright 2023 Uber Technologies, Inc.
+// Licensed under the Apache License, Version 2.0
+
 // This file tests that problematic functions (glibc-hacks) work.
 // Also see https://github.com/ziglang/zig/issues/9485
 
diff --git a/test/gorace/BUILD b/test/gorace/BUILD
index c12112a..4079180 100644
--- a/test/gorace/BUILD
+++ b/test/gorace/BUILD
@@ -1,3 +1,6 @@
+# Copyright 2023 Uber Technologies, Inc.
+# Licensed under the Apache License, Version 2.0
+
 load("@io_bazel_rules_go//go:def.bzl", "go_library", "go_test")
 load("//rules:rules_go.bzl", "go_binary")
 
diff --git a/test/gorace/main.go b/test/gorace/main.go
index dd52075..87a4de0 100644
--- a/test/gorace/main.go
+++ b/test/gorace/main.go
@@ -1,3 +1,6 @@
+// Copyright 2023 Uber Technologies, Inc.
+// Licensed under the Apache License, Version 2.0
+//
 // Package main tests that Zig can compile race-enabled tests.
 //
 // As of writing, this fails:
diff --git a/test/gorace/main_test.go b/test/gorace/main_test.go
index 2ad7482..3c2992f 100644
--- a/test/gorace/main_test.go
+++ b/test/gorace/main_test.go
@@ -1,3 +1,6 @@
+// Copyright 2023 Uber Technologies, Inc.
+// Licensed under the Apache License, Version 2.0
+
 package main
 
 import "testing"
diff --git a/test/windows/BUILD b/test/windows/BUILD
index cb8d17a..f73b932 100644
--- a/test/windows/BUILD
+++ b/test/windows/BUILD
@@ -1,3 +1,6 @@
+# Copyright 2023 Uber Technologies, Inc.
+# Licensed under the Apache License, Version 2.0
+
 load("@bazel-zig-cc//rules:platform.bzl", "platform_binary", "platform_test")
 
 cc_binary(
diff --git a/test/windows/main.c b/test/windows/main.c
index b5302af..dd67443 100644
--- a/test/windows/main.c
+++ b/test/windows/main.c
@@ -1,3 +1,6 @@
+// Copyright 2023 Uber Technologies, Inc.
+// Licensed under the Apache License, Version 2.0
+
 #include <stdio.h>
 #include <windows.h>
 
diff --git a/toolchain/BUILD.sdk.bazel b/toolchain/BUILD.sdk.bazel
index bea4447..2855dcd 100644
--- a/toolchain/BUILD.sdk.bazel
+++ b/toolchain/BUILD.sdk.bazel
@@ -1,3 +1,6 @@
+# Copyright 2023 Uber Technologies, Inc.
+# Licensed under the Apache License, Version 2.0
+
 load("@bazel-zig-cc//toolchain:defs.bzl", "declare_files")
 load("@bazel-zig-cc//toolchain/private:cc_toolchains.bzl", "declare_cc_toolchains")
 
diff --git a/toolchain/launcher.zig b/toolchain/launcher.zig
index 142e99c..aadd9fc 100644
--- a/toolchain/launcher.zig
+++ b/toolchain/launcher.zig
@@ -1,3 +1,6 @@
+// Copyright 2023 Uber Technologies, Inc.
+// Licensed under the Apache License, Version 2.0
+//
 // A wrapper for `zig` subcommands.
 //
 // In simple cases it is usually enough to:
diff --git a/toolchain/libc/BUILD b/toolchain/libc/BUILD
index e2713f8..85e0791 100644
--- a/toolchain/libc/BUILD
+++ b/toolchain/libc/BUILD
@@ -1,3 +1,6 @@
+# Copyright 2023 Uber Technologies, Inc.
+# Licensed under the Apache License, Version 2.0
+
 load("@bazel-zig-cc//toolchain/libc:defs.bzl", "declare_libcs")
 
 package(
diff --git a/toolchain/libc/defs.bzl b/toolchain/libc/defs.bzl
index 58532b0..f3f7d3d 100644
--- a/toolchain/libc/defs.bzl
+++ b/toolchain/libc/defs.bzl
@@ -1,3 +1,6 @@
+# Copyright 2023 Uber Technologies, Inc.
+# Licensed under the Apache License, Version 2.0
+
 load("@bazel-zig-cc//toolchain/private:defs.bzl", "LIBCS")
 
 def declare_libcs():
diff --git a/toolchain/libc_aware/platform/BUILD b/toolchain/libc_aware/platform/BUILD
index b34acc6..5ff3171 100644
--- a/toolchain/libc_aware/platform/BUILD
+++ b/toolchain/libc_aware/platform/BUILD
@@ -1,3 +1,6 @@
+# Copyright 2023 Uber Technologies, Inc.
+# Licensed under the Apache License, Version 2.0
+
 load("@bazel-zig-cc//toolchain/platform:defs.bzl", "declare_libc_aware_platforms")
 
 package(
diff --git a/toolchain/libc_aware/toolchain/BUILD b/toolchain/libc_aware/toolchain/BUILD
index 98065fd..13a851f 100644
--- a/toolchain/libc_aware/toolchain/BUILD
+++ b/toolchain/libc_aware/toolchain/BUILD
@@ -1,3 +1,6 @@
+# Copyright 2023 Uber Technologies, Inc.
+# Licensed under the Apache License, Version 2.0
+
 load("@bazel-zig-cc//toolchain/toolchain:defs.bzl", "declare_libc_aware_toolchains")
 
 package(