diff --git a/.copywrite.hcl b/.copywrite.hcl
new file mode 100644
index 00000000..35eae082
--- /dev/null
+++ b/.copywrite.hcl
@@ -0,0 +1,16 @@
+schema_version = 1
+
+project {
+  license        = "MPL-2.0"
+  copyright_year = 2014
+
+  # (OPTIONAL) A list of globs that should not have copyright/license headers.
+  # Supports doublestar glob patterns for more flexibility in defining which
+  # files or folders should be ignored
+  header_ignore = [
+    "hclsyntax/fuzz/testdata/**",
+    "hclwrite/fuzz/testdata/**",
+    "json/fuzz/testdata/**",
+    "specsuite/tests/**",
+  ]
+}
diff --git a/cmd/hcldec/diags_json.go b/cmd/hcldec/diags_json.go
index f0b4a40a..f5939b9e 100644
--- a/cmd/hcldec/diags_json.go
+++ b/cmd/hcldec/diags_json.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package main
 
 import (
diff --git a/cmd/hcldec/examples/sh-config-file/example.sh b/cmd/hcldec/examples/sh-config-file/example.sh
index 95a00805..4544c268 100755
--- a/cmd/hcldec/examples/sh-config-file/example.sh
+++ b/cmd/hcldec/examples/sh-config-file/example.sh
@@ -1,4 +1,7 @@
 #!/bin/bash
+# Copyright (c) HashiCorp, Inc.
+# SPDX-License-Identifier: MPL-2.0
+
 
 set -euo pipefail
 
diff --git a/cmd/hcldec/main.go b/cmd/hcldec/main.go
index 5be672dd..1ddc8006 100644
--- a/cmd/hcldec/main.go
+++ b/cmd/hcldec/main.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package main
 
 import (
diff --git a/cmd/hcldec/spec.go b/cmd/hcldec/spec.go
index b592cf9d..a011d1c9 100644
--- a/cmd/hcldec/spec.go
+++ b/cmd/hcldec/spec.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package main
 
 import (
diff --git a/cmd/hcldec/spec_funcs.go b/cmd/hcldec/spec_funcs.go
index 99c8ea6a..f7bdaf08 100644
--- a/cmd/hcldec/spec_funcs.go
+++ b/cmd/hcldec/spec_funcs.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package main
 
 import (
diff --git a/cmd/hcldec/type_expr.go b/cmd/hcldec/type_expr.go
index 3e36420d..ed838d70 100644
--- a/cmd/hcldec/type_expr.go
+++ b/cmd/hcldec/type_expr.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package main
 
 import (
diff --git a/cmd/hcldec/vars.go b/cmd/hcldec/vars.go
index d3971cbc..cf70136d 100644
--- a/cmd/hcldec/vars.go
+++ b/cmd/hcldec/vars.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package main
 
 import (
diff --git a/cmd/hclfmt/main.go b/cmd/hclfmt/main.go
index 41901cf6..aff04270 100644
--- a/cmd/hclfmt/main.go
+++ b/cmd/hclfmt/main.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package main
 
 import (
diff --git a/cmd/hclspecsuite/diagnostics.go b/cmd/hclspecsuite/diagnostics.go
index 129fdd21..97eb1df7 100644
--- a/cmd/hclspecsuite/diagnostics.go
+++ b/cmd/hclspecsuite/diagnostics.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package main
 
 import (
diff --git a/cmd/hclspecsuite/log.go b/cmd/hclspecsuite/log.go
index 022c7be2..b31937b2 100644
--- a/cmd/hclspecsuite/log.go
+++ b/cmd/hclspecsuite/log.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package main
 
 import (
diff --git a/cmd/hclspecsuite/main.go b/cmd/hclspecsuite/main.go
index 384ee02f..9f4ee604 100644
--- a/cmd/hclspecsuite/main.go
+++ b/cmd/hclspecsuite/main.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package main
 
 import (
diff --git a/cmd/hclspecsuite/runner.go b/cmd/hclspecsuite/runner.go
index db9b13f8..11efa071 100644
--- a/cmd/hclspecsuite/runner.go
+++ b/cmd/hclspecsuite/runner.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package main
 
 import (
diff --git a/cmd/hclspecsuite/test_file.go b/cmd/hclspecsuite/test_file.go
index 57ed35ee..95649d0f 100644
--- a/cmd/hclspecsuite/test_file.go
+++ b/cmd/hclspecsuite/test_file.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package main
 
 import (
diff --git a/cmd/hclspecsuite/traversals.go b/cmd/hclspecsuite/traversals.go
index d689390c..8a8a9443 100644
--- a/cmd/hclspecsuite/traversals.go
+++ b/cmd/hclspecsuite/traversals.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package main
 
 import (
diff --git a/diagnostic.go b/diagnostic.go
index bcf4eb39..578f81a2 100644
--- a/diagnostic.go
+++ b/diagnostic.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hcl
 
 import (
diff --git a/diagnostic_text.go b/diagnostic_text.go
index 0b4a2629..bdfad42b 100644
--- a/diagnostic_text.go
+++ b/diagnostic_text.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hcl
 
 import (
diff --git a/diagnostic_text_test.go b/diagnostic_text_test.go
index 8757fbe6..1057998a 100644
--- a/diagnostic_text_test.go
+++ b/diagnostic_text_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hcl
 
 import (
diff --git a/diagnostic_typeparams.go b/diagnostic_typeparams.go
index 6994e233..92be8f1a 100644
--- a/diagnostic_typeparams.go
+++ b/diagnostic_typeparams.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 //go:build go1.18
 // +build go1.18
 
diff --git a/didyoumean.go b/didyoumean.go
index c1283344..fd00ca6f 100644
--- a/didyoumean.go
+++ b/didyoumean.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hcl
 
 import (
diff --git a/doc.go b/doc.go
index 0d43fb2c..a0e3119f 100644
--- a/doc.go
+++ b/doc.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 // Package hcl contains the main modelling types and general utility functions
 // for HCL.
 //
diff --git a/eval_context.go b/eval_context.go
index 915910ad..921cfcb4 100644
--- a/eval_context.go
+++ b/eval_context.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hcl
 
 import (
diff --git a/expr_call.go b/expr_call.go
index 6963fbae..ca59b90d 100644
--- a/expr_call.go
+++ b/expr_call.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hcl
 
 // ExprCall tests if the given expression is a function call and,
diff --git a/expr_list.go b/expr_list.go
index d05cca0b..8c0cf405 100644
--- a/expr_list.go
+++ b/expr_list.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hcl
 
 // ExprList tests if the given expression is a static list construct and,
diff --git a/expr_map.go b/expr_map.go
index 96d1ce4b..56cf9747 100644
--- a/expr_map.go
+++ b/expr_map.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hcl
 
 // ExprMap tests if the given expression is a static map construct and,
diff --git a/expr_unwrap.go b/expr_unwrap.go
index 6d5d205c..6683fd54 100644
--- a/expr_unwrap.go
+++ b/expr_unwrap.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hcl
 
 type unwrapExpression interface {
diff --git a/ext/customdecode/customdecode.go b/ext/customdecode/customdecode.go
index c9d7a1ef..e0dda0df 100644
--- a/ext/customdecode/customdecode.go
+++ b/ext/customdecode/customdecode.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 // Package customdecode contains a HCL extension that allows, in certain
 // contexts, expression evaluation to be overridden by custom static analysis.
 //
diff --git a/ext/customdecode/expression_type.go b/ext/customdecode/expression_type.go
index af7c66c2..2477f219 100644
--- a/ext/customdecode/expression_type.go
+++ b/ext/customdecode/expression_type.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package customdecode
 
 import (
diff --git a/ext/dynblock/expand_body.go b/ext/dynblock/expand_body.go
index 0b68a7ae..0d870842 100644
--- a/ext/dynblock/expand_body.go
+++ b/ext/dynblock/expand_body.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package dynblock
 
 import (
diff --git a/ext/dynblock/expand_body_test.go b/ext/dynblock/expand_body_test.go
index a6544526..ccc4d303 100644
--- a/ext/dynblock/expand_body_test.go
+++ b/ext/dynblock/expand_body_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package dynblock
 
 import (
diff --git a/ext/dynblock/expand_spec.go b/ext/dynblock/expand_spec.go
index 98a51ead..23295d33 100644
--- a/ext/dynblock/expand_spec.go
+++ b/ext/dynblock/expand_spec.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package dynblock
 
 import (
diff --git a/ext/dynblock/expr_wrap.go b/ext/dynblock/expr_wrap.go
index 460a1d2a..625bf9cc 100644
--- a/ext/dynblock/expr_wrap.go
+++ b/ext/dynblock/expr_wrap.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package dynblock
 
 import (
diff --git a/ext/dynblock/iteration.go b/ext/dynblock/iteration.go
index c5663886..9e811a48 100644
--- a/ext/dynblock/iteration.go
+++ b/ext/dynblock/iteration.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package dynblock
 
 import (
diff --git a/ext/dynblock/public.go b/ext/dynblock/public.go
index a5bfd94e..abee67c4 100644
--- a/ext/dynblock/public.go
+++ b/ext/dynblock/public.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 // Package dynblock provides an extension to HCL that allows dynamic
 // declaration of nested blocks in certain contexts via a special block type
 // named "dynamic".
diff --git a/ext/dynblock/schema.go b/ext/dynblock/schema.go
index b3907d6e..026008bd 100644
--- a/ext/dynblock/schema.go
+++ b/ext/dynblock/schema.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package dynblock
 
 import "github.com/hashicorp/hcl/v2"
diff --git a/ext/dynblock/unknown_body.go b/ext/dynblock/unknown_body.go
index caa20853..6cd59c77 100644
--- a/ext/dynblock/unknown_body.go
+++ b/ext/dynblock/unknown_body.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package dynblock
 
 import (
diff --git a/ext/dynblock/variables.go b/ext/dynblock/variables.go
index 19233929..1eb1f1e8 100644
--- a/ext/dynblock/variables.go
+++ b/ext/dynblock/variables.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package dynblock
 
 import (
diff --git a/ext/dynblock/variables_hcldec.go b/ext/dynblock/variables_hcldec.go
index 907ef3eb..caaf9df4 100644
--- a/ext/dynblock/variables_hcldec.go
+++ b/ext/dynblock/variables_hcldec.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package dynblock
 
 import (
diff --git a/ext/dynblock/variables_test.go b/ext/dynblock/variables_test.go
index b3a2d721..ee8adaa9 100644
--- a/ext/dynblock/variables_test.go
+++ b/ext/dynblock/variables_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package dynblock
 
 import (
diff --git a/ext/transform/doc.go b/ext/transform/doc.go
index ac466698..6744467a 100644
--- a/ext/transform/doc.go
+++ b/ext/transform/doc.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 // Package transform is a helper package for writing extensions that work
 // by applying transforms to bodies.
 //
diff --git a/ext/transform/error.go b/ext/transform/error.go
index 6063e2bc..38e064b8 100644
--- a/ext/transform/error.go
+++ b/ext/transform/error.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package transform
 
 import (
diff --git a/ext/transform/transform.go b/ext/transform/transform.go
index f0f5ff69..035044e4 100644
--- a/ext/transform/transform.go
+++ b/ext/transform/transform.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package transform
 
 import (
diff --git a/ext/transform/transform_test.go b/ext/transform/transform_test.go
index 7b68aca3..5d4b6667 100644
--- a/ext/transform/transform_test.go
+++ b/ext/transform/transform_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package transform
 
 import (
diff --git a/ext/transform/transformer.go b/ext/transform/transformer.go
index 2599cdd4..511d0a29 100644
--- a/ext/transform/transformer.go
+++ b/ext/transform/transformer.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package transform
 
 import (
diff --git a/ext/tryfunc/tryfunc.go b/ext/tryfunc/tryfunc.go
index 2f4862f4..47789858 100644
--- a/ext/tryfunc/tryfunc.go
+++ b/ext/tryfunc/tryfunc.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 // Package tryfunc contains some optional functions that can be exposed in
 // HCL-based languages to allow authors to test whether a particular expression
 // can succeed and take dynamic action based on that result.
diff --git a/ext/tryfunc/tryfunc_test.go b/ext/tryfunc/tryfunc_test.go
index dc32a6de..1e75a163 100644
--- a/ext/tryfunc/tryfunc_test.go
+++ b/ext/tryfunc/tryfunc_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package tryfunc
 
 import (
diff --git a/ext/typeexpr/defaults.go b/ext/typeexpr/defaults.go
index f2962139..7e09e54e 100644
--- a/ext/typeexpr/defaults.go
+++ b/ext/typeexpr/defaults.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package typeexpr
 
 import (
diff --git a/ext/typeexpr/defaults_test.go b/ext/typeexpr/defaults_test.go
index 49f151b4..fcfd2924 100644
--- a/ext/typeexpr/defaults_test.go
+++ b/ext/typeexpr/defaults_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package typeexpr
 
 import (
diff --git a/ext/typeexpr/doc.go b/ext/typeexpr/doc.go
index c4b37957..9c5ab6e2 100644
--- a/ext/typeexpr/doc.go
+++ b/ext/typeexpr/doc.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 // Package typeexpr extends HCL with a convention for describing HCL types
 // within configuration files.
 //
diff --git a/ext/typeexpr/get_type.go b/ext/typeexpr/get_type.go
index 890cf8ed..64e3995a 100644
--- a/ext/typeexpr/get_type.go
+++ b/ext/typeexpr/get_type.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package typeexpr
 
 import (
diff --git a/ext/typeexpr/get_type_test.go b/ext/typeexpr/get_type_test.go
index d349d72a..7976bb87 100644
--- a/ext/typeexpr/get_type_test.go
+++ b/ext/typeexpr/get_type_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package typeexpr
 
 import (
diff --git a/ext/typeexpr/public.go b/ext/typeexpr/public.go
index f2e187ef..e03631d3 100644
--- a/ext/typeexpr/public.go
+++ b/ext/typeexpr/public.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package typeexpr
 
 import (
diff --git a/ext/typeexpr/type_string_test.go b/ext/typeexpr/type_string_test.go
index fbdf3f48..d9a52404 100644
--- a/ext/typeexpr/type_string_test.go
+++ b/ext/typeexpr/type_string_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package typeexpr
 
 import (
diff --git a/ext/typeexpr/type_type.go b/ext/typeexpr/type_type.go
index 5462d82c..3ca0ba43 100644
--- a/ext/typeexpr/type_type.go
+++ b/ext/typeexpr/type_type.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package typeexpr
 
 import (
diff --git a/ext/typeexpr/type_type_test.go b/ext/typeexpr/type_type_test.go
index 2286a2e1..328ead6d 100644
--- a/ext/typeexpr/type_type_test.go
+++ b/ext/typeexpr/type_type_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package typeexpr
 
 import (
diff --git a/ext/userfunc/decode.go b/ext/userfunc/decode.go
index 6c1e4ca4..3f3c533e 100644
--- a/ext/userfunc/decode.go
+++ b/ext/userfunc/decode.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package userfunc
 
 import (
diff --git a/ext/userfunc/decode_test.go b/ext/userfunc/decode_test.go
index 633c6d8c..60841b21 100644
--- a/ext/userfunc/decode_test.go
+++ b/ext/userfunc/decode_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package userfunc
 
 import (
diff --git a/ext/userfunc/doc.go b/ext/userfunc/doc.go
index e4461d45..4134e807 100644
--- a/ext/userfunc/doc.go
+++ b/ext/userfunc/doc.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 // Package userfunc implements a HCL extension that allows user-defined
 // functions in HCL configuration.
 //
diff --git a/ext/userfunc/public.go b/ext/userfunc/public.go
index 5415c8c9..8e6c9bfb 100644
--- a/ext/userfunc/public.go
+++ b/ext/userfunc/public.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package userfunc
 
 import (
diff --git a/gohcl/decode.go b/gohcl/decode.go
index 2954f4ce..2d1776a3 100644
--- a/gohcl/decode.go
+++ b/gohcl/decode.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package gohcl
 
 import (
diff --git a/gohcl/decode_test.go b/gohcl/decode_test.go
index 50eaea7f..1ac5d049 100644
--- a/gohcl/decode_test.go
+++ b/gohcl/decode_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package gohcl
 
 import (
diff --git a/gohcl/doc.go b/gohcl/doc.go
index 9dcd970b..cfec2530 100644
--- a/gohcl/doc.go
+++ b/gohcl/doc.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 // Package gohcl allows decoding HCL configurations into Go data structures.
 //
 // It provides a convenient and concise way of describing the schema for
diff --git a/gohcl/encode.go b/gohcl/encode.go
index d612e09c..64cb2d1e 100644
--- a/gohcl/encode.go
+++ b/gohcl/encode.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package gohcl
 
 import (
diff --git a/gohcl/encode_test.go b/gohcl/encode_test.go
index 9778df7f..a75bf28b 100644
--- a/gohcl/encode_test.go
+++ b/gohcl/encode_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package gohcl_test
 
 import (
diff --git a/gohcl/schema.go b/gohcl/schema.go
index df21cc49..0cdca271 100644
--- a/gohcl/schema.go
+++ b/gohcl/schema.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package gohcl
 
 import (
diff --git a/gohcl/schema_test.go b/gohcl/schema_test.go
index cea77ca9..ca8c0ec1 100644
--- a/gohcl/schema_test.go
+++ b/gohcl/schema_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package gohcl
 
 import (
diff --git a/gohcl/types.go b/gohcl/types.go
index a8d00f8f..302e454c 100644
--- a/gohcl/types.go
+++ b/gohcl/types.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package gohcl
 
 import (
diff --git a/hcldec/block_labels.go b/hcldec/block_labels.go
index 71de4519..9e6f1f2c 100644
--- a/hcldec/block_labels.go
+++ b/hcldec/block_labels.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hcldec
 
 import (
diff --git a/hcldec/decode.go b/hcldec/decode.go
index c6e42236..5f86e67f 100644
--- a/hcldec/decode.go
+++ b/hcldec/decode.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hcldec
 
 import (
diff --git a/hcldec/doc.go b/hcldec/doc.go
index 23bfe542..c8439401 100644
--- a/hcldec/doc.go
+++ b/hcldec/doc.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 // Package hcldec provides a higher-level API for unpacking the content of
 // HCL bodies, implemented in terms of the low-level "Content" API exposed
 // by the bodies themselves.
diff --git a/hcldec/gob.go b/hcldec/gob.go
index e2027cfd..27e9be2e 100644
--- a/hcldec/gob.go
+++ b/hcldec/gob.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hcldec
 
 import (
diff --git a/hcldec/public.go b/hcldec/public.go
index 1fa548d0..ff1e5fe9 100644
--- a/hcldec/public.go
+++ b/hcldec/public.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hcldec
 
 import (
diff --git a/hcldec/public_test.go b/hcldec/public_test.go
index 20521fbe..edd0c534 100644
--- a/hcldec/public_test.go
+++ b/hcldec/public_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hcldec
 
 import (
diff --git a/hcldec/schema.go b/hcldec/schema.go
index ddbe7fa4..8a9fa4fe 100644
--- a/hcldec/schema.go
+++ b/hcldec/schema.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hcldec
 
 import (
diff --git a/hcldec/spec.go b/hcldec/spec.go
index 42cb070d..b31ec175 100644
--- a/hcldec/spec.go
+++ b/hcldec/spec.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hcldec
 
 import (
diff --git a/hcldec/spec_test.go b/hcldec/spec_test.go
index 61d60c98..d59b6050 100644
--- a/hcldec/spec_test.go
+++ b/hcldec/spec_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hcldec
 
 import (
diff --git a/hcldec/variables.go b/hcldec/variables.go
index f8440eb6..c5ac1744 100644
--- a/hcldec/variables.go
+++ b/hcldec/variables.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hcldec
 
 import (
diff --git a/hcldec/variables_test.go b/hcldec/variables_test.go
index 53bb99d1..10412deb 100644
--- a/hcldec/variables_test.go
+++ b/hcldec/variables_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hcldec
 
 import (
diff --git a/hcled/doc.go b/hcled/doc.go
index 1a801448..51b335a1 100644
--- a/hcled/doc.go
+++ b/hcled/doc.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 // Package hcled provides functionality intended to help an application
 // that embeds HCL to deliver relevant information to a text editor or IDE
 // for navigating around and analyzing configuration files.
diff --git a/hcled/navigation.go b/hcled/navigation.go
index 050ad758..85935696 100644
--- a/hcled/navigation.go
+++ b/hcled/navigation.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hcled
 
 import (
diff --git a/hclparse/parser.go b/hclparse/parser.go
index 1dc2eccd..c9b843d0 100644
--- a/hclparse/parser.go
+++ b/hclparse/parser.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 // Package hclparse has the main API entry point for parsing both HCL native
 // syntax and HCL JSON.
 //
diff --git a/hclsimple/hclsimple.go b/hclsimple/hclsimple.go
index 09bc4f7f..a3ba45c2 100644
--- a/hclsimple/hclsimple.go
+++ b/hclsimple/hclsimple.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 // Package hclsimple is a higher-level entry point for loading HCL
 // configuration files directly into Go struct values in a single step.
 //
diff --git a/hclsimple/hclsimple_test.go b/hclsimple/hclsimple_test.go
index b395804e..034edd53 100644
--- a/hclsimple/hclsimple_test.go
+++ b/hclsimple/hclsimple_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclsimple_test
 
 import (
diff --git a/hclsimple/testdata/test.hcl b/hclsimple/testdata/test.hcl
index 4383b2f8..ee536036 100644
--- a/hclsimple/testdata/test.hcl
+++ b/hclsimple/testdata/test.hcl
@@ -1,2 +1,5 @@
+# Copyright (c) HashiCorp, Inc.
+# SPDX-License-Identifier: MPL-2.0
+
 foo = "bar"
 baz = "boop"
diff --git a/hclsyntax/diagnostics.go b/hclsyntax/diagnostics.go
index 8c20286b..43689d74 100644
--- a/hclsyntax/diagnostics.go
+++ b/hclsyntax/diagnostics.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclsyntax
 
 import (
diff --git a/hclsyntax/didyoumean.go b/hclsyntax/didyoumean.go
index ccc1c0ae..5b0e4681 100644
--- a/hclsyntax/didyoumean.go
+++ b/hclsyntax/didyoumean.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclsyntax
 
 import (
diff --git a/hclsyntax/didyoumean_test.go b/hclsyntax/didyoumean_test.go
index 9d04b7b7..84cfed6d 100644
--- a/hclsyntax/didyoumean_test.go
+++ b/hclsyntax/didyoumean_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclsyntax
 
 import "testing"
diff --git a/hclsyntax/doc.go b/hclsyntax/doc.go
index 617bc29d..defe3dbb 100644
--- a/hclsyntax/doc.go
+++ b/hclsyntax/doc.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 // Package hclsyntax contains the parser, AST, etc for HCL's native language,
 // as opposed to the JSON variant.
 //
diff --git a/hclsyntax/expression.go b/hclsyntax/expression.go
index 358fd5d5..55fecd4e 100644
--- a/hclsyntax/expression.go
+++ b/hclsyntax/expression.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclsyntax
 
 import (
diff --git a/hclsyntax/expression_ops.go b/hclsyntax/expression_ops.go
index c1db0cec..6585612c 100644
--- a/hclsyntax/expression_ops.go
+++ b/hclsyntax/expression_ops.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclsyntax
 
 import (
diff --git a/hclsyntax/expression_static_test.go b/hclsyntax/expression_static_test.go
index 3aeadec4..9b23b727 100644
--- a/hclsyntax/expression_static_test.go
+++ b/hclsyntax/expression_static_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclsyntax
 
 import (
diff --git a/hclsyntax/expression_template.go b/hclsyntax/expression_template.go
index c3f96943..0b5ac195 100644
--- a/hclsyntax/expression_template.go
+++ b/hclsyntax/expression_template.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclsyntax
 
 import (
diff --git a/hclsyntax/expression_template_test.go b/hclsyntax/expression_template_test.go
index e67d71d3..624a2cd0 100644
--- a/hclsyntax/expression_template_test.go
+++ b/hclsyntax/expression_template_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclsyntax
 
 import (
diff --git a/hclsyntax/expression_test.go b/hclsyntax/expression_test.go
index 05db38d4..df1e1939 100644
--- a/hclsyntax/expression_test.go
+++ b/hclsyntax/expression_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclsyntax
 
 import (
diff --git a/hclsyntax/expression_typeparams_test.go b/hclsyntax/expression_typeparams_test.go
index f88e6a34..4ee9a77e 100644
--- a/hclsyntax/expression_typeparams_test.go
+++ b/hclsyntax/expression_typeparams_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 //go:build go1.18
 // +build go1.18
 
diff --git a/hclsyntax/expression_vars.go b/hclsyntax/expression_vars.go
index a82bf790..ce5a5cb7 100755
--- a/hclsyntax/expression_vars.go
+++ b/hclsyntax/expression_vars.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclsyntax
 
 // Generated by expression_vars_get.go. DO NOT EDIT.
diff --git a/hclsyntax/expression_vars_gen.go b/hclsyntax/expression_vars_gen.go
index 7b7572cc..6ab79276 100644
--- a/hclsyntax/expression_vars_gen.go
+++ b/hclsyntax/expression_vars_gen.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 // This is a 'go generate'-oriented program for producing the "Variables"
 // method on every Expression implementation found within this package.
 // All expressions share the same implementation for this method, which
diff --git a/hclsyntax/file.go b/hclsyntax/file.go
index f55e9ce2..7be626ff 100644
--- a/hclsyntax/file.go
+++ b/hclsyntax/file.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclsyntax
 
 import (
diff --git a/hclsyntax/fuzz/fuzz_test.go b/hclsyntax/fuzz/fuzz_test.go
index 4f0d1534..4aaee5d0 100644
--- a/hclsyntax/fuzz/fuzz_test.go
+++ b/hclsyntax/fuzz/fuzz_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package fuzzhclsyntax
 
 import (
diff --git a/hclsyntax/generate.go b/hclsyntax/generate.go
index 841656a6..383ec6b8 100644
--- a/hclsyntax/generate.go
+++ b/hclsyntax/generate.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclsyntax
 
 //go:generate go run expression_vars_gen.go
diff --git a/hclsyntax/keywords.go b/hclsyntax/keywords.go
index eef8b962..5124ae95 100644
--- a/hclsyntax/keywords.go
+++ b/hclsyntax/keywords.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclsyntax
 
 import (
diff --git a/hclsyntax/navigation.go b/hclsyntax/navigation.go
index af98ef04..83e1d4ef 100644
--- a/hclsyntax/navigation.go
+++ b/hclsyntax/navigation.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclsyntax
 
 import (
diff --git a/hclsyntax/navigation_test.go b/hclsyntax/navigation_test.go
index 221f1b49..12187398 100644
--- a/hclsyntax/navigation_test.go
+++ b/hclsyntax/navigation_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclsyntax
 
 import (
diff --git a/hclsyntax/node.go b/hclsyntax/node.go
index 41b35e53..6ead6091 100644
--- a/hclsyntax/node.go
+++ b/hclsyntax/node.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclsyntax
 
 import (
diff --git a/hclsyntax/parse_traversal_test.go b/hclsyntax/parse_traversal_test.go
index 329fe58e..3ca5fc2b 100644
--- a/hclsyntax/parse_traversal_test.go
+++ b/hclsyntax/parse_traversal_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclsyntax
 
 import (
diff --git a/hclsyntax/parser.go b/hclsyntax/parser.go
index 109c1c81..6ed88e63 100644
--- a/hclsyntax/parser.go
+++ b/hclsyntax/parser.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclsyntax
 
 import (
diff --git a/hclsyntax/parser_template.go b/hclsyntax/parser_template.go
index 7cf262a0..3ac68298 100644
--- a/hclsyntax/parser_template.go
+++ b/hclsyntax/parser_template.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclsyntax
 
 import (
diff --git a/hclsyntax/parser_test.go b/hclsyntax/parser_test.go
index 7e2484a1..69636c9f 100644
--- a/hclsyntax/parser_test.go
+++ b/hclsyntax/parser_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclsyntax
 
 import (
diff --git a/hclsyntax/parser_traversal.go b/hclsyntax/parser_traversal.go
index 7dcb0fd3..3afa6ab0 100644
--- a/hclsyntax/parser_traversal.go
+++ b/hclsyntax/parser_traversal.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclsyntax
 
 import (
diff --git a/hclsyntax/peeker.go b/hclsyntax/peeker.go
index f056f906..74fa3fb3 100644
--- a/hclsyntax/peeker.go
+++ b/hclsyntax/peeker.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclsyntax
 
 import (
diff --git a/hclsyntax/peeker_test.go b/hclsyntax/peeker_test.go
index 626d77b3..cce3266d 100644
--- a/hclsyntax/peeker_test.go
+++ b/hclsyntax/peeker_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclsyntax
 
 import (
diff --git a/hclsyntax/public.go b/hclsyntax/public.go
index 0b68efd6..d56f8e50 100644
--- a/hclsyntax/public.go
+++ b/hclsyntax/public.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclsyntax
 
 import (
diff --git a/hclsyntax/public_test.go b/hclsyntax/public_test.go
index 596b1a26..6cdd3b17 100644
--- a/hclsyntax/public_test.go
+++ b/hclsyntax/public_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclsyntax
 
 import (
diff --git a/hclsyntax/scan_string_lit.go b/hclsyntax/scan_string_lit.go
index 2895ade7..5d60ff5a 100644
--- a/hclsyntax/scan_string_lit.go
+++ b/hclsyntax/scan_string_lit.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 //line scan_string_lit.rl:1
 
 package hclsyntax
diff --git a/hclsyntax/scan_string_lit_test.go b/hclsyntax/scan_string_lit_test.go
index c1b8cd36..bebad0ee 100644
--- a/hclsyntax/scan_string_lit_test.go
+++ b/hclsyntax/scan_string_lit_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclsyntax
 
 import (
diff --git a/hclsyntax/scan_tokens.go b/hclsyntax/scan_tokens.go
index 794123a8..1bbbb927 100644
--- a/hclsyntax/scan_tokens.go
+++ b/hclsyntax/scan_tokens.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 //line scan_tokens.rl:1
 
 package hclsyntax
diff --git a/hclsyntax/scan_tokens_test.go b/hclsyntax/scan_tokens_test.go
index c4537385..f3b6eeb4 100644
--- a/hclsyntax/scan_tokens_test.go
+++ b/hclsyntax/scan_tokens_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclsyntax
 
 import (
diff --git a/hclsyntax/structure.go b/hclsyntax/structure.go
index f42ae918..ff272631 100644
--- a/hclsyntax/structure.go
+++ b/hclsyntax/structure.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclsyntax
 
 import (
diff --git a/hclsyntax/structure_at_pos.go b/hclsyntax/structure_at_pos.go
index 587844ac..50857168 100644
--- a/hclsyntax/structure_at_pos.go
+++ b/hclsyntax/structure_at_pos.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclsyntax
 
 import (
diff --git a/hclsyntax/structure_at_pos_test.go b/hclsyntax/structure_at_pos_test.go
index ead77bfb..052a938a 100644
--- a/hclsyntax/structure_at_pos_test.go
+++ b/hclsyntax/structure_at_pos_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclsyntax
 
 import (
diff --git a/hclsyntax/structure_test.go b/hclsyntax/structure_test.go
index ec1ff6df..c86dc328 100644
--- a/hclsyntax/structure_test.go
+++ b/hclsyntax/structure_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclsyntax
 
 import (
diff --git a/hclsyntax/token.go b/hclsyntax/token.go
index 5ef093f9..a14b3940 100644
--- a/hclsyntax/token.go
+++ b/hclsyntax/token.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclsyntax
 
 import (
diff --git a/hclsyntax/token_test.go b/hclsyntax/token_test.go
index a954d603..2ce05479 100644
--- a/hclsyntax/token_test.go
+++ b/hclsyntax/token_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclsyntax
 
 import (
diff --git a/hclsyntax/unicode2ragel.rb b/hclsyntax/unicode2ragel.rb
index 422e4e5c..235265de 100644
--- a/hclsyntax/unicode2ragel.rb
+++ b/hclsyntax/unicode2ragel.rb
@@ -1,4 +1,7 @@
 #!/usr/bin/env ruby
+# Copyright (c) HashiCorp, Inc.
+# SPDX-License-Identifier: MPL-2.0
+
 #
 # This scripted has been updated to accept more command-line arguments:
 #
diff --git a/hclsyntax/variables.go b/hclsyntax/variables.go
index 3d68c413..b4be9269 100644
--- a/hclsyntax/variables.go
+++ b/hclsyntax/variables.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclsyntax
 
 import (
diff --git a/hclsyntax/variables_test.go b/hclsyntax/variables_test.go
index 8c22ede2..c841d94a 100644
--- a/hclsyntax/variables_test.go
+++ b/hclsyntax/variables_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclsyntax
 
 import (
diff --git a/hclsyntax/walk.go b/hclsyntax/walk.go
index 89bfe676..82b6f9b0 100644
--- a/hclsyntax/walk.go
+++ b/hclsyntax/walk.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclsyntax
 
 import (
diff --git a/hclsyntax/walk_test.go b/hclsyntax/walk_test.go
index 9200199a..5ac0ca88 100644
--- a/hclsyntax/walk_test.go
+++ b/hclsyntax/walk_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclsyntax
 
 import (
diff --git a/hcltest/doc.go b/hcltest/doc.go
index 3abad003..d450a2b9 100644
--- a/hcltest/doc.go
+++ b/hcltest/doc.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 // Package hcltest contains utilities that aim to make it more convenient
 // to write tests for code that interacts with the HCL API.
 //
diff --git a/hcltest/mock.go b/hcltest/mock.go
index 5f5e82cb..9df3e8d1 100644
--- a/hcltest/mock.go
+++ b/hcltest/mock.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hcltest
 
 import (
diff --git a/hcltest/mock_test.go b/hcltest/mock_test.go
index 5b01d022..eb0e6db1 100644
--- a/hcltest/mock_test.go
+++ b/hcltest/mock_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hcltest
 
 import (
diff --git a/hclwrite/ast.go b/hclwrite/ast.go
index 09041652..d2f9daec 100644
--- a/hclwrite/ast.go
+++ b/hclwrite/ast.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclwrite
 
 import (
diff --git a/hclwrite/ast_attribute.go b/hclwrite/ast_attribute.go
index 609419ff..3edc68c0 100644
--- a/hclwrite/ast_attribute.go
+++ b/hclwrite/ast_attribute.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclwrite
 
 import (
diff --git a/hclwrite/ast_block.go b/hclwrite/ast_block.go
index edabb26a..91e7d4a3 100644
--- a/hclwrite/ast_block.go
+++ b/hclwrite/ast_block.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclwrite
 
 import (
diff --git a/hclwrite/ast_block_test.go b/hclwrite/ast_block_test.go
index 81290404..0760001a 100644
--- a/hclwrite/ast_block_test.go
+++ b/hclwrite/ast_block_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclwrite
 
 import (
diff --git a/hclwrite/ast_body.go b/hclwrite/ast_body.go
index 119f53e6..6321509a 100644
--- a/hclwrite/ast_body.go
+++ b/hclwrite/ast_body.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclwrite
 
 import (
diff --git a/hclwrite/ast_body_test.go b/hclwrite/ast_body_test.go
index 53367861..1e235234 100644
--- a/hclwrite/ast_body_test.go
+++ b/hclwrite/ast_body_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclwrite
 
 import (
diff --git a/hclwrite/ast_expression.go b/hclwrite/ast_expression.go
index 073c3087..77b9f780 100644
--- a/hclwrite/ast_expression.go
+++ b/hclwrite/ast_expression.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclwrite
 
 import (
diff --git a/hclwrite/ast_test.go b/hclwrite/ast_test.go
index 08f7801f..12bb0546 100644
--- a/hclwrite/ast_test.go
+++ b/hclwrite/ast_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclwrite
 
 import (
diff --git a/hclwrite/doc.go b/hclwrite/doc.go
index 56d5b775..57ec37ea 100644
--- a/hclwrite/doc.go
+++ b/hclwrite/doc.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 // Package hclwrite deals with the problem of generating HCL configuration
 // and of making specific surgical changes to existing HCL configurations.
 //
diff --git a/hclwrite/examples_test.go b/hclwrite/examples_test.go
index f848ce29..f61d7827 100644
--- a/hclwrite/examples_test.go
+++ b/hclwrite/examples_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclwrite_test
 
 import (
diff --git a/hclwrite/format.go b/hclwrite/format.go
index dca247ee..d5f974c3 100644
--- a/hclwrite/format.go
+++ b/hclwrite/format.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclwrite
 
 import (
diff --git a/hclwrite/format_test.go b/hclwrite/format_test.go
index 037157a9..e64b551f 100644
--- a/hclwrite/format_test.go
+++ b/hclwrite/format_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclwrite
 
 import (
diff --git a/hclwrite/fuzz/fuzz_test.go b/hclwrite/fuzz/fuzz_test.go
index fa29af93..573741c7 100644
--- a/hclwrite/fuzz/fuzz_test.go
+++ b/hclwrite/fuzz/fuzz_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package fuzzhclwrite
 
 import (
diff --git a/hclwrite/generate.go b/hclwrite/generate.go
index 6f6a2e63..678d5391 100644
--- a/hclwrite/generate.go
+++ b/hclwrite/generate.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclwrite
 
 import (
diff --git a/hclwrite/generate_test.go b/hclwrite/generate_test.go
index 06fa0944..87dffeca 100644
--- a/hclwrite/generate_test.go
+++ b/hclwrite/generate_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclwrite
 
 import (
diff --git a/hclwrite/native_node_sorter.go b/hclwrite/native_node_sorter.go
index cedf6862..0a78683b 100644
--- a/hclwrite/native_node_sorter.go
+++ b/hclwrite/native_node_sorter.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclwrite
 
 import (
diff --git a/hclwrite/node.go b/hclwrite/node.go
index d3a5b72c..7ad4bb91 100644
--- a/hclwrite/node.go
+++ b/hclwrite/node.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclwrite
 
 import (
diff --git a/hclwrite/parser.go b/hclwrite/parser.go
index 3df51447..53415aeb 100644
--- a/hclwrite/parser.go
+++ b/hclwrite/parser.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclwrite
 
 import (
diff --git a/hclwrite/parser_test.go b/hclwrite/parser_test.go
index 6edebc74..e557940e 100644
--- a/hclwrite/parser_test.go
+++ b/hclwrite/parser_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclwrite
 
 import (
diff --git a/hclwrite/public.go b/hclwrite/public.go
index 678a3aa4..8003a71d 100644
--- a/hclwrite/public.go
+++ b/hclwrite/public.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclwrite
 
 import (
diff --git a/hclwrite/round_trip_test.go b/hclwrite/round_trip_test.go
index 8ce9c4f7..bf306de5 100644
--- a/hclwrite/round_trip_test.go
+++ b/hclwrite/round_trip_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclwrite
 
 import (
diff --git a/hclwrite/tokens.go b/hclwrite/tokens.go
index 57a5fd2b..909bb4bb 100644
--- a/hclwrite/tokens.go
+++ b/hclwrite/tokens.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hclwrite
 
 import (
diff --git a/integrationtest/convertfunc_test.go b/integrationtest/convertfunc_test.go
index ffcb0efe..0dc2adde 100644
--- a/integrationtest/convertfunc_test.go
+++ b/integrationtest/convertfunc_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package integrationtest
 
 import (
diff --git a/integrationtest/doc.go b/integrationtest/doc.go
index 18f030c2..1a8146fe 100644
--- a/integrationtest/doc.go
+++ b/integrationtest/doc.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 // Package integrationtest is an internal package that contains some
 // tests that attempt to exercise many HCL features together in realistic
 // scenarios. This is in addition to -- but not a substitute for -- unit tests
diff --git a/integrationtest/hcldec_into_expr_test.go b/integrationtest/hcldec_into_expr_test.go
index cd713dd3..9b00f3bd 100644
--- a/integrationtest/hcldec_into_expr_test.go
+++ b/integrationtest/hcldec_into_expr_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package integrationtest
 
 import (
diff --git a/integrationtest/terraformlike_test.go b/integrationtest/terraformlike_test.go
index b900c43f..89783462 100644
--- a/integrationtest/terraformlike_test.go
+++ b/integrationtest/terraformlike_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package integrationtest
 
 import (
diff --git a/json/ast.go b/json/ast.go
index 9c580ca3..3b385cce 100644
--- a/json/ast.go
+++ b/json/ast.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package json
 
 import (
diff --git a/json/didyoumean.go b/json/didyoumean.go
index fbdd8bff..dc004c4b 100644
--- a/json/didyoumean.go
+++ b/json/didyoumean.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package json
 
 import (
diff --git a/json/didyoumean_test.go b/json/didyoumean_test.go
index 999876ab..f189790b 100644
--- a/json/didyoumean_test.go
+++ b/json/didyoumean_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package json
 
 import "testing"
diff --git a/json/doc.go b/json/doc.go
index 84d73193..bdc8f093 100644
--- a/json/doc.go
+++ b/json/doc.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 // Package json is the JSON parser for HCL. It parses JSON files and returns
 // implementations of the core HCL structural interfaces in terms of the
 // JSON data inside.
diff --git a/json/fuzz/fuzz_test.go b/json/fuzz/fuzz_test.go
index f77c96ba..ccc21184 100644
--- a/json/fuzz/fuzz_test.go
+++ b/json/fuzz/fuzz_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package fuzzjson
 
 import (
diff --git a/json/is.go b/json/is.go
index 73c6775f..1d1a0b18 100644
--- a/json/is.go
+++ b/json/is.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package json
 
 import (
diff --git a/json/navigation.go b/json/navigation.go
index bc8a97f7..7aab1ec0 100644
--- a/json/navigation.go
+++ b/json/navigation.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package json
 
 import (
diff --git a/json/navigation_test.go b/json/navigation_test.go
index f8355e11..f22a9ff4 100644
--- a/json/navigation_test.go
+++ b/json/navigation_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package json
 
 import (
diff --git a/json/parser.go b/json/parser.go
index 6b7420b9..6b9bbf3e 100644
--- a/json/parser.go
+++ b/json/parser.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package json
 
 import (
diff --git a/json/parser_test.go b/json/parser_test.go
index dd0b373b..8f77630d 100644
--- a/json/parser_test.go
+++ b/json/parser_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package json
 
 import (
diff --git a/json/peeker.go b/json/peeker.go
index fc7bbf58..02efa5b2 100644
--- a/json/peeker.go
+++ b/json/peeker.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package json
 
 type peeker struct {
diff --git a/json/public.go b/json/public.go
index d1e4faf5..f36e52c8 100644
--- a/json/public.go
+++ b/json/public.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package json
 
 import (
diff --git a/json/public_test.go b/json/public_test.go
index 554b165a..6ecf40fa 100644
--- a/json/public_test.go
+++ b/json/public_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package json
 
 import (
diff --git a/json/scanner.go b/json/scanner.go
index b7111631..d15c1a33 100644
--- a/json/scanner.go
+++ b/json/scanner.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package json
 
 import (
diff --git a/json/scanner_test.go b/json/scanner_test.go
index eb4ea3ed..d59c201e 100644
--- a/json/scanner_test.go
+++ b/json/scanner_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package json
 
 import (
diff --git a/json/structure.go b/json/structure.go
index 76c9d739..3b7c425c 100644
--- a/json/structure.go
+++ b/json/structure.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package json
 
 import (
diff --git a/json/structure_test.go b/json/structure_test.go
index 4d53cbda..d05a1d68 100644
--- a/json/structure_test.go
+++ b/json/structure_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package json
 
 import (
diff --git a/merged.go b/merged.go
index 96e62a58..27fd1ed5 100644
--- a/merged.go
+++ b/merged.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hcl
 
 import (
diff --git a/merged_test.go b/merged_test.go
index fdc5b087..598f2287 100644
--- a/merged_test.go
+++ b/merged_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hcl
 
 import (
diff --git a/ops.go b/ops.go
index 47dc02ad..bdf23614 100644
--- a/ops.go
+++ b/ops.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hcl
 
 import (
diff --git a/ops_test.go b/ops_test.go
index f627b1e3..7aabd7a2 100644
--- a/ops_test.go
+++ b/ops_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hcl
 
 import (
diff --git a/pos.go b/pos.go
index 06db8bfb..1bbbce87 100644
--- a/pos.go
+++ b/pos.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hcl
 
 import "fmt"
diff --git a/pos_scanner.go b/pos_scanner.go
index 49077fc5..cff55392 100644
--- a/pos_scanner.go
+++ b/pos_scanner.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hcl
 
 import (
diff --git a/pos_scanner_test.go b/pos_scanner_test.go
index b0dc902c..bb6a89a5 100644
--- a/pos_scanner_test.go
+++ b/pos_scanner_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hcl
 
 import (
diff --git a/pos_test.go b/pos_test.go
index cfa41375..b90545b8 100644
--- a/pos_test.go
+++ b/pos_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hcl
 
 import (
diff --git a/schema.go b/schema.go
index 891257ac..d4e339cb 100644
--- a/schema.go
+++ b/schema.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hcl
 
 // BlockHeaderSchema represents the shape of a block header, and is
diff --git a/specsuite/spec_test.go b/specsuite/spec_test.go
index 46bf067e..36360a64 100644
--- a/specsuite/spec_test.go
+++ b/specsuite/spec_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package spectests
 
 import (
diff --git a/static_expr.go b/static_expr.go
index 98ada87b..e14d7f89 100644
--- a/static_expr.go
+++ b/static_expr.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hcl
 
 import (
diff --git a/structure.go b/structure.go
index aab09457..2bdf579d 100644
--- a/structure.go
+++ b/structure.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hcl
 
 import (
diff --git a/structure_at_pos.go b/structure_at_pos.go
index 8521814e..62aba139 100644
--- a/structure_at_pos.go
+++ b/structure_at_pos.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hcl
 
 // -----------------------------------------------------------------------------
diff --git a/traversal.go b/traversal.go
index d7101970..540dde7e 100644
--- a/traversal.go
+++ b/traversal.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hcl
 
 import (
diff --git a/traversal_for_expr.go b/traversal_for_expr.go
index f69d5fe9..8ce00c6d 100644
--- a/traversal_for_expr.go
+++ b/traversal_for_expr.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hcl
 
 // AbsTraversalForExpr attempts to interpret the given expression as
diff --git a/traversal_for_expr_test.go b/traversal_for_expr_test.go
index 9a9539f6..5bfcebf0 100644
--- a/traversal_for_expr_test.go
+++ b/traversal_for_expr_test.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package hcl
 
 import (