diff --git a/engine/src/flutter/impeller/fixtures/sample.vert b/engine/src/flutter/impeller/fixtures/sample.vert
index ba455ccb866..2c1e03a481d 100644
--- a/engine/src/flutter/impeller/fixtures/sample.vert
+++ b/engine/src/flutter/impeller/fixtures/sample.vert
@@ -1,3 +1,7 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
 #include "types.h"
 
 uniform UniformBufferObject {
diff --git a/engine/src/flutter/impeller/geometry/BUILD.gn b/engine/src/flutter/impeller/geometry/BUILD.gn
index becb1677f99..cc3bad32b8b 100644
--- a/engine/src/flutter/impeller/geometry/BUILD.gn
+++ b/engine/src/flutter/impeller/geometry/BUILD.gn
@@ -8,6 +8,8 @@ impeller_component("geometry") {
   sources = [
     "color.cc",
     "color.h",
+    "constants.cc",
+    "constants.h",
     "matrix.cc",
     "matrix.h",
     "matrix_decomposition.cc",
diff --git a/engine/src/flutter/impeller/geometry/constants.cc b/engine/src/flutter/impeller/geometry/constants.cc
index e69de29bb2d..115a24da4a3 100644
--- a/engine/src/flutter/impeller/geometry/constants.cc
+++ b/engine/src/flutter/impeller/geometry/constants.cc
@@ -0,0 +1,11 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "impeller/geometry/constants.h"
+
+namespace impeller {
+
+//
+
+}  // namespace impeller
diff --git a/engine/src/flutter/impeller/playground/imgui/BUILD.gn b/engine/src/flutter/impeller/playground/imgui/BUILD.gn
index 9f1e0d3b89d..c56377f7301 100644
--- a/engine/src/flutter/impeller/playground/imgui/BUILD.gn
+++ b/engine/src/flutter/impeller/playground/imgui/BUILD.gn
@@ -1,3 +1,7 @@
+# Copyright 2013 The Flutter Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
 import("//flutter/impeller/tools/impeller.gni")
 
 impeller_shaders("imgui_shaders") {
diff --git a/engine/src/flutter/impeller/playground/imgui/imgui_impl_impeller.cc b/engine/src/flutter/impeller/playground/imgui/imgui_impl_impeller.cc
index 0d898b151a2..245397fc0f4 100644
--- a/engine/src/flutter/impeller/playground/imgui/imgui_impl_impeller.cc
+++ b/engine/src/flutter/impeller/playground/imgui/imgui_impl_impeller.cc
@@ -1,3 +1,7 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
 #include "imgui_impl_impeller.h"
 
 #include <algorithm>
diff --git a/engine/src/flutter/impeller/playground/imgui/imgui_impl_impeller.h b/engine/src/flutter/impeller/playground/imgui/imgui_impl_impeller.h
index ffdaaa072d5..585e8b2f2df 100644
--- a/engine/src/flutter/impeller/playground/imgui/imgui_impl_impeller.h
+++ b/engine/src/flutter/impeller/playground/imgui/imgui_impl_impeller.h
@@ -1,3 +1,7 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
 #pragma once
 
 #include <memory>
@@ -5,8 +9,10 @@
 #include "third_party/imgui/imgui.h"
 
 namespace impeller {
+
 class Context;
 class RenderPass;
+
 }  // namespace impeller
 
 IMGUI_IMPL_API bool ImGui_ImplImpeller_Init(
diff --git a/engine/src/flutter/impeller/playground/imgui/imgui_raster.frag b/engine/src/flutter/impeller/playground/imgui/imgui_raster.frag
index 890a7842458..f159e20d698 100644
--- a/engine/src/flutter/impeller/playground/imgui/imgui_raster.frag
+++ b/engine/src/flutter/impeller/playground/imgui/imgui_raster.frag
@@ -1,3 +1,7 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
 in vec2 frag_texture_coordinates;
 in vec4 frag_vertex_color;
 
diff --git a/engine/src/flutter/impeller/playground/imgui/imgui_raster.vert b/engine/src/flutter/impeller/playground/imgui/imgui_raster.vert
index 391c14eb3d0..1afd7900225 100644
--- a/engine/src/flutter/impeller/playground/imgui/imgui_raster.vert
+++ b/engine/src/flutter/impeller/playground/imgui/imgui_raster.vert
@@ -1,3 +1,7 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
 uniform UniformBuffer {
   mat4 mvp;
 }
diff --git a/engine/src/flutter/impeller/tools/check_licenses.py b/engine/src/flutter/impeller/tools/check_licenses.py
new file mode 100644
index 00000000000..50dc9210122
--- /dev/null
+++ b/engine/src/flutter/impeller/tools/check_licenses.py
@@ -0,0 +1,77 @@
+# Copyright 2013 The Flutter Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import argparse
+import os
+
+
+def ContainsLicenseBlock(source_file):
+  # This check is somewhat easier than in the engine because all sources need to
+  # have the same license.
+  py_license = '''# Copyright 2013 The Flutter Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.'''
+  c_license = py_license.replace("#", "//")
+
+  # Make sure we don't read the entire file into memory.
+  read_size = (max(len(py_license), len(c_license)))
+
+  for license in [c_license, py_license]:
+    with open(source_file) as source:
+      if source.read(read_size).startswith(license):
+        return True
+
+  return False
+
+
+def IsSourceFile(path):
+  known_extensions = [
+    ".cc",
+    ".cpp",
+    ".c",
+    ".h",
+    ".hpp",
+    ".py",
+    ".sh",
+    ".gn",
+    ".gni",
+    ".glsl",
+    ".sl.h",
+    ".vert",
+    ".frag",
+    ".tesc",
+    ".tese",
+    ".yaml",
+    ".dart",
+  ]
+  for extension in known_extensions:
+    if os.path.basename(path).endswith(extension):
+      return True
+  return False;
+
+
+# Checks that all source files have the same license preamble.
+def Main():
+  parser = argparse.ArgumentParser()
+  parser.add_argument("--source-root",
+                    type=str, required=True,
+                    help="The source root.")
+  args = parser.parse_args()
+
+  assert(os.path.exists(args.source_root))
+
+  source_files = set()
+
+  for root, dirs, files in os.walk(os.path.abspath(args.source_root)):
+    for file in files:
+      file_path = os.path.join(root, file)
+      if IsSourceFile(file_path):
+        source_files.add(file_path)
+
+  for source_file in source_files:
+    if not ContainsLicenseBlock(source_file):
+      raise Exception("Could not find valid license block in source ", source_file)
+
+if __name__ == '__main__':
+  Main()