diff --git a/.clang-format b/.clang-format
index 30e883dbf2..cc814fc852 100644
--- a/.clang-format
+++ b/.clang-format
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright Contributors to the OpenEXR Project.
 ---
 Language:        Cpp
 # BasedOnStyle:  LLVM
diff --git a/.github/workflows/cifuzz.yml b/.github/workflows/cifuzz.yml
index 04ca79a520..ae33a8eaeb 100644
--- a/.github/workflows/cifuzz.yml
+++ b/.github/workflows/cifuzz.yml
@@ -1,3 +1,6 @@
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright Contributors to the OpenEXR Project.
+
 name: CIFuzz
 on: 
   pull_request:
diff --git a/.gitignore b/.gitignore
index 60eb47c5aa..975e5c722a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright Contributors to the OpenEXR Project.
 Makefile
 Makefile.in
 autom4te.cache
diff --git a/.readthedocs.yml b/.readthedocs.yml
index 12a8dbf59e..e33eb043d4 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -1,3 +1,6 @@
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright Contributors to the OpenEXR Project.
+
 # .readthedocs.yml
 # Read the Docs configuration file
 # See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
diff --git a/WORKSPACE.bazel b/WORKSPACE.bazel
index 28aeff91a6..4c12980daf 100644
--- a/WORKSPACE.bazel
+++ b/WORKSPACE.bazel
@@ -1,3 +1,6 @@
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright Contributors to the OpenEXR Project.
+
 workspace(name = "com_openexr")
 
 load("//:bazel/third_party/openexr_deps.bzl", "openexr_deps")
diff --git a/share/ci/scripts/linux/install_valgrind.sh b/share/ci/scripts/linux/install_valgrind.sh
index d6135fd6bf..effd720ae9 100755
--- a/share/ci/scripts/linux/install_valgrind.sh
+++ b/share/ci/scripts/linux/install_valgrind.sh
@@ -1,5 +1,8 @@
 #!/usr/bin/env bash
 
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright Contributors to the OpenEXR Project.
+
 set -ex
 
 VALGRIND_VERSION="3.15.0"
diff --git a/share/ci/scripts/linux/log_valgrind.sh b/share/ci/scripts/linux/log_valgrind.sh
index 39183ba269..b853930888 100755
--- a/share/ci/scripts/linux/log_valgrind.sh
+++ b/share/ci/scripts/linux/log_valgrind.sh
@@ -1,5 +1,8 @@
 #!/usr/bin/env bash
 
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright Contributors to the OpenEXR Project.
+
 set -ex
 
 LOGDIR="$1"
diff --git a/share/ci/scripts/linux/validate_openexr_libs.sh b/share/ci/scripts/linux/validate_openexr_libs.sh
index 2fcd20c22e..4dc6509c3b 100755
--- a/share/ci/scripts/linux/validate_openexr_libs.sh
+++ b/share/ci/scripts/linux/validate_openexr_libs.sh
@@ -1,5 +1,8 @@
 #!/usr/bin/env bash
 
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright Contributors to the OpenEXR Project.
+
 #
 # Validate the library symlinks:
 #   * The actual elf binary is, e.g. libIlmThread-3_1.so.29.0.0
diff --git a/src/test/IexTest/mathFuncs.cpp b/src/test/IexTest/mathFuncs.cpp
index de7ebd10b1..2777584ced 100644
--- a/src/test/IexTest/mathFuncs.cpp
+++ b/src/test/IexTest/mathFuncs.cpp
@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright Contributors to the OpenEXR Project.
+
 #undef __THROW
 #include <math.h>
 #include <iostream>
diff --git a/src/test/IexTest/mathFuncs.h b/src/test/IexTest/mathFuncs.h
index 1ebd2fbcae..032c7df91a 100644
--- a/src/test/IexTest/mathFuncs.h
+++ b/src/test/IexTest/mathFuncs.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright Contributors to the OpenEXR Project.
 
 float divide (float x, float y);
 float root (float x);
diff --git a/src/test/IexTest/testMathExc.h b/src/test/IexTest/testMathExc.h
index 89c8d507bb..94f73babbf 100644
--- a/src/test/IexTest/testMathExc.h
+++ b/src/test/IexTest/testMathExc.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+// Copyright Contributors to the OpenEXR Project.
 
 void testMathExc();