diff --git a/internal/plans/internal/planproto/planfile.pb.go b/internal/plans/internal/planproto/planfile.pb.go
index d6d4fd39bf..121dc24b7a 100644
--- a/internal/plans/internal/planproto/planfile.pb.go
+++ b/internal/plans/internal/planproto/planfile.pb.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.28.1
diff --git a/internal/tfplugin5/tfplugin5.pb.go b/internal/tfplugin5/tfplugin5.pb.go
index eb92a23320..3dfc603cc5 100644
--- a/internal/tfplugin5/tfplugin5.pb.go
+++ b/internal/tfplugin5/tfplugin5.pb.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 // Terraform Plugin RPC protocol version 5.3
 //
 // This file defines version 5.3 of the RPC protocol. To implement a plugin
diff --git a/internal/tfplugin6/tfplugin6.pb.go b/internal/tfplugin6/tfplugin6.pb.go
index b66ffec7f8..96ffacca9a 100644
--- a/internal/tfplugin6/tfplugin6.pb.go
+++ b/internal/tfplugin6/tfplugin6.pb.go
@@ -1,3 +1,6 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 // Terraform Plugin RPC protocol version 6.3
 //
 // This file defines version 6.3 of the RPC protocol. To implement a plugin