diff --git a/plugin/attributes.go b/plugin/attributes.go
index a887f7a..ce97af4 100644
--- a/plugin/attributes.go
+++ b/plugin/attributes.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package plugin
 
 import (
diff --git a/plugin/attributes_test.go b/plugin/attributes_test.go
index ecfbdb5..bef01ce 100644
--- a/plugin/attributes_test.go
+++ b/plugin/attributes_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package plugin
 
 import (
diff --git a/plugin/const.go b/plugin/const.go
index 3f654ff..25587ab 100644
--- a/plugin/const.go
+++ b/plugin/const.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package plugin
 
 const (
diff --git a/plugin/e2e_test.go b/plugin/e2e_test.go
index be7f8bc..887f848 100644
--- a/plugin/e2e_test.go
+++ b/plugin/e2e_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package plugin
 
 import (
diff --git a/plugin/helper_test.go b/plugin/helper_test.go
index 2f5cc3d..72b31d5 100644
--- a/plugin/helper_test.go
+++ b/plugin/helper_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package plugin
 
 import (
diff --git a/plugin/option.go b/plugin/option.go
index 2a8e3e5..7ec5e25 100644
--- a/plugin/option.go
+++ b/plugin/option.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package plugin
 
 // getOpts iterates the inbound Options and returns a struct
diff --git a/plugin/plugin.go b/plugin/plugin.go
index 42247bc..cc484e8 100644
--- a/plugin/plugin.go
+++ b/plugin/plugin.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package plugin
 
 import (
diff --git a/plugin/plugin_test.go b/plugin/plugin_test.go
index 442e578..9e3e97a 100644
--- a/plugin/plugin_test.go
+++ b/plugin/plugin_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package plugin
 
 import (
diff --git a/plugin/state.go b/plugin/state.go
index f71805a..233f7d5 100644
--- a/plugin/state.go
+++ b/plugin/state.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package plugin
 
 import (
diff --git a/plugin/state_test.go b/plugin/state_test.go
index 6240a67..b9979a4 100644
--- a/plugin/state_test.go
+++ b/plugin/state_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package plugin
 
 import (
diff --git a/plugin/testdata/basic/iam.tf b/plugin/testdata/basic/iam.tf
index fbee0fd..221d84c 100644
--- a/plugin/testdata/basic/iam.tf
+++ b/plugin/testdata/basic/iam.tf
@@ -1,3 +1,6 @@
+# Copyright (c) HashiCorp, Inc.
+# SPDX-License-Identifier: MPL-2.0
+
 variable "iam_user_prefix" {
   default = "boundary-plugin-host-aws-test-iam-user"
 }
diff --git a/plugin/testdata/basic/main.tf b/plugin/testdata/basic/main.tf
index d95dec2..9ef1261 100644
--- a/plugin/testdata/basic/main.tf
+++ b/plugin/testdata/basic/main.tf
@@ -1,3 +1,6 @@
+# Copyright (c) HashiCorp, Inc.
+# SPDX-License-Identifier: MPL-2.0
+
 terraform {
   required_providers {
     aws = {
diff --git a/plugin/testdata/basic/vpc_ec2.tf b/plugin/testdata/basic/vpc_ec2.tf
index c612283..9619304 100644
--- a/plugin/testdata/basic/vpc_ec2.tf
+++ b/plugin/testdata/basic/vpc_ec2.tf
@@ -1,3 +1,6 @@
+# Copyright (c) HashiCorp, Inc.
+# SPDX-License-Identifier: MPL-2.0
+
 variable "instance_tags" {
   default = [
     {
diff --git a/testing/testdata/main.tf b/testing/testdata/main.tf
index ac6b10d..88b739f 100644
--- a/testing/testdata/main.tf
+++ b/testing/testdata/main.tf
@@ -1,3 +1,6 @@
+# Copyright (c) HashiCorp, Inc.
+# SPDX-License-Identifier: MPL-2.0
+
 resource "random_id" "foo" {
   byte_length = 2
   prefix      = "test-foo"
diff --git a/testing/testing.go b/testing/testing.go
index d816d97..d37507d 100644
--- a/testing/testing.go
+++ b/testing/testing.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package testing
 
 import (
diff --git a/testing/testing_test.go b/testing/testing_test.go
index 9b93050..77b0afc 100644
--- a/testing/testing_test.go
+++ b/testing/testing_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package testing
 
 import (