diff --git a/cryptoutil/rsa_test.go b/cryptoutil/rsa_test.go
index 3814ab9..1165dfd 100644
--- a/cryptoutil/rsa_test.go
+++ b/cryptoutil/rsa_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package cryptoutil
 
 import (
diff --git a/permitpool/example_test.go b/permitpool/example_test.go
index 7fdd13f..a86f83c 100644
--- a/permitpool/example_test.go
+++ b/permitpool/example_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package permitpool_test
 
 import (
diff --git a/permitpool/permitpool.go b/permitpool/permitpool.go
index 77fe631..751cd59 100644
--- a/permitpool/permitpool.go
+++ b/permitpool/permitpool.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 // Package permitpool exposes a synchronization primitive for
 // limiting the number of concurrent operations. See the Pool
 // example for a simple use case.
diff --git a/permitpool/permitpool_test.go b/permitpool/permitpool_test.go
index f816fea..8cd9181 100644
--- a/permitpool/permitpool_test.go
+++ b/permitpool/permitpool_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package permitpool_test
 
 import (
diff --git a/regexp/regexp.go b/regexp/regexp.go
index f258694..ea567d7 100644
--- a/regexp/regexp.go
+++ b/regexp/regexp.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package regexp
 
 import (
diff --git a/regexp/regexp_test.go b/regexp/regexp_test.go
index 1f29572..c4e45ac 100644
--- a/regexp/regexp_test.go
+++ b/regexp/regexp_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package regexp
 
 import (