diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 495779bf..6289982a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -24,6 +24,13 @@ concurrency:
   cancel-in-progress: false
 
 jobs:
+  reuse-compliance:
+    name: REUSE License Compliance
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - uses: fsfe/reuse-action@v5
+
   checks:
     runs-on: ubuntu-latest
     steps:
diff --git a/LICENSES/FSL-1.1-ALv2.md b/LICENSES/FSL-1.1-ALv2.md
new file mode 100644
index 00000000..e4a61ef2
--- /dev/null
+++ b/LICENSES/FSL-1.1-ALv2.md
@@ -0,0 +1,105 @@
+# Functional Source License, Version 1.1, ALv2 Future License
+
+## Abbreviation
+
+FSL-1.1-ALv2
+
+## Notice
+
+Copyright 2025 Platform Engineering Labs Inc.
+
+## Terms and Conditions
+
+### Licensor ("We")
+
+The party offering the Software under these Terms and Conditions.
+
+### The Software
+
+The "Software" is each version of the software that we make available under
+these Terms and Conditions, as indicated by our inclusion of these Terms and
+Conditions with the Software.
+
+### License Grant
+
+Subject to your compliance with this License Grant and the Patents,
+Redistribution and Trademark clauses below, we hereby grant you the right to
+use, copy, modify, create derivative works, publicly perform, publicly display
+and redistribute the Software for any Permitted Purpose identified below.
+
+### Permitted Purpose
+
+A Permitted Purpose is any purpose other than a Competing Use. A Competing Use
+means making the Software available to others in a commercial product or
+service that:
+
+1. substitutes for the Software;
+
+2. substitutes for any other product or service we offer using the Software
+   that exists as of the date we make the Software available; or
+
+3. offers the same or substantially similar functionality as the Software.
+
+Permitted Purposes specifically include using the Software:
+
+1. for your internal use and access;
+
+2. for non-commercial education;
+
+3. for non-commercial research; and
+
+4. in connection with professional services that you provide to a licensee
+   using the Software in accordance with these Terms and Conditions.
+
+### Patents
+
+To the extent your use for a Permitted Purpose would necessarily infringe our
+patents, the license grant above includes a license under our patents. If you
+make a claim against any party that the Software infringes or contributes to
+the infringement of any patent, then your patent license to the Software ends
+immediately.
+
+### Redistribution
+
+The Terms and Conditions apply to all copies, modifications and derivatives of
+the Software.
+
+If you redistribute any copies, modifications or derivatives of the Software,
+you must include a copy of or a link to these Terms and Conditions and not
+remove any copyright notices provided in or with the Software.
+
+### Disclaimer
+
+THE SOFTWARE IS PROVIDED "AS IS" AND WITHOUT WARRANTIES OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING WITHOUT LIMITATION WARRANTIES OF FITNESS FOR A PARTICULAR
+PURPOSE, MERCHANTABILITY, TITLE OR NON-INFRINGEMENT.
+
+IN NO EVENT WILL WE HAVE ANY LIABILITY TO YOU ARISING OUT OF OR RELATED TO THE
+SOFTWARE, INCLUDING INDIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES,
+EVEN IF WE HAVE BEEN INFORMED OF THEIR POSSIBILITY IN ADVANCE.
+
+### Trademarks
+
+Except for displaying the License Details and identifying us as the origin of
+the Software, you have no right under these Terms and Conditions to use our
+trademarks, trade names, service marks or product names.
+
+## Grant of Future License
+
+We hereby irrevocably grant you an additional license to use the Software under
+the Apache License, Version 2.0 that is effective on the second anniversary of
+the date we make the Software available. On or after that date, you may use the
+Software under the Apache License, Version 2.0, in which case the following
+will apply:
+
+Licensed under the Apache License, Version 2.0 (the "License"); you may not use
+this file except in compliance with the License.
+
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software distributed
+under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+CONDITIONS OF ANY KIND, either express or implied. See the License for the
+specific language governing permissions and limitations under the License.
diff --git a/Makefile b/Makefile
index 93413618..1083e165 100644
--- a/Makefile
+++ b/Makefile
@@ -57,6 +57,14 @@ test-integration:
 lint:
 	golangci-lint run
 
+## lint-reuse: Check REUSE license compliance
+lint-reuse:
+	./scripts/lint_reuse.sh
+
+## add-license: Add license headers to source files (idempotent)
+add-license:
+	./scripts/add_license.sh
+
 ## verify-schema: Validate PKL schema files
 ## Checks that schema files are well-formed and follow formae conventions.
 verify-schema:
diff --git a/REUSE.toml b/REUSE.toml
new file mode 100644
index 00000000..02b430d0
--- /dev/null
+++ b/REUSE.toml
@@ -0,0 +1,37 @@
+version = 1
+
+# Configuration files
+[[annotations]]
+path = ["**/*.yml", "**/*.yaml", "**/*.json", "**/*.mod", "**/*.sum", "**/*.lock", "**/*.toml", ".gitignore", "**/.gitignore", "Makefile", "**/PklProject", "Opkgfile"]
+SPDX-FileCopyrightText = "© 2025 Platform Engineering Labs Inc."
+SPDX-License-Identifier = "FSL-1.1-ALv2"
+
+# Shell scripts in scripts/ directory
+[[annotations]]
+path = ["scripts/**/*.sh"]
+SPDX-FileCopyrightText = "© 2025 Platform Engineering Labs Inc."
+SPDX-License-Identifier = "FSL-1.1-ALv2"
+
+# Documentation files
+[[annotations]]
+path = ["**/*.md", "**/*.html"]
+SPDX-FileCopyrightText = "© 2025 Platform Engineering Labs Inc."
+SPDX-License-Identifier = "FSL-1.1-ALv2"
+
+# Binary and generated test files
+[[annotations]]
+path = ["**/*.zip", "**/*.pcf", "**/*.log", "**/*.txt"]
+SPDX-FileCopyrightText = "© 2025 Platform Engineering Labs Inc."
+SPDX-License-Identifier = "FSL-1.1-ALv2"
+
+# Misc plain-text and example/env files
+[[annotations]]
+path = [".env.example", "**/VERSION"]
+SPDX-FileCopyrightText = "© 2025 Platform Engineering Labs Inc."
+SPDX-License-Identifier = "FSL-1.1-ALv2"
+
+# Dockerfile
+[[annotations]]
+path = ["**/Dockerfile*"]
+SPDX-FileCopyrightText = "© 2025 Platform Engineering Labs Inc."
+SPDX-License-Identifier = "FSL-1.1-ALv2"
diff --git a/examples/debug-stack.pkl b/examples/debug-stack.pkl
index 92016280..3b3e8cc7 100644
--- a/examples/debug-stack.pkl
+++ b/examples/debug-stack.pkl
@@ -1,3 +1,9 @@
+/*
+ * © 2025 Platform Engineering Labs Inc.
+ *
+ * SPDX-License-Identifier: FSL-1.1-ALv2
+ */
+
 amends "@formae/forma.pkl"
 import "@formae/formae.pkl"
 import "@aws/aws.pkl"
diff --git a/examples/stack-test.pkl b/examples/stack-test.pkl
index 9127ad7b..911adf4c 100644
--- a/examples/stack-test.pkl
+++ b/examples/stack-test.pkl
@@ -1,3 +1,9 @@
+/*
+ * © 2025 Platform Engineering Labs Inc.
+ *
+ * SPDX-License-Identifier: FSL-1.1-ALv2
+ */
+
 amends "@formae/forma.pkl"
 import "@formae/formae.pkl"
 import "@aws/aws.pkl"
diff --git a/examples/test-stack.pkl b/examples/test-stack.pkl
index 6f533a23..e55e365e 100644
--- a/examples/test-stack.pkl
+++ b/examples/test-stack.pkl
@@ -1,3 +1,9 @@
+/*
+ * © 2025 Platform Engineering Labs Inc.
+ *
+ * SPDX-License-Identifier: FSL-1.1-ALv2
+ */
+
 amends "@formae/forma.pkl"
 import "@formae/formae.pkl"
 
diff --git a/scripts/add_license.sh b/scripts/add_license.sh
new file mode 100755
index 00000000..c5544625
--- /dev/null
+++ b/scripts/add_license.sh
@@ -0,0 +1,33 @@
+#!/bin/bash
+# Add license headers to source files (idempotent)
+
+if ! command -v reuse >/dev/null 2>&1; then
+    echo "Error: REUSE tool not installed."
+    echo "Install with: pipx install reuse"
+    exit 1
+fi
+
+echo "Adding license headers to source files (this is idempotent)..."
+
+echo "Processing Go files..."
+find . -name "*.go" -not -path "*/.git/*" | \
+    xargs reuse annotate --copyright="Platform Engineering Labs Inc." --year=2025 \
+    --copyright-prefix=symbol --license=FSL-1.1-ALv2
+
+echo "Processing Pkl files..."
+find . -name "*.pkl" -not -path "*/.git/*" | \
+    xargs reuse annotate --copyright="Platform Engineering Labs Inc." --year=2025 \
+    --copyright-prefix=symbol --license=FSL-1.1-ALv2 --style c
+
+echo "Processing Python files..."
+find . -name "*.py" -not -path "*/.git/*" | \
+    xargs reuse annotate --copyright="Platform Engineering Labs Inc." --year=2025 \
+    --copyright-prefix=symbol --license=FSL-1.1-ALv2 || true
+
+echo "Processing Shell scripts..."
+find . -name "*.sh" -not -path "*/.git/*" -not -path "*/scripts/*" | \
+    xargs reuse annotate --copyright="Platform Engineering Labs Inc." --year=2025 \
+    --copyright-prefix=symbol --license=FSL-1.1-ALv2 || true
+
+echo "Done! Run 'make lint-reuse' to verify"
+
diff --git a/scripts/lint_reuse.sh b/scripts/lint_reuse.sh
new file mode 100755
index 00000000..bb585208
--- /dev/null
+++ b/scripts/lint_reuse.sh
@@ -0,0 +1,12 @@
+#!/bin/bash
+# Check REUSE compliance (optional for developers, required in CI)
+
+if ! command -v reuse >/dev/null 2>&1; then
+    echo "REUSE tool not installed. Install with: pipx install reuse"
+    echo "Skipping local check - CI will catch any issues."
+    exit 0
+fi
+
+echo "Checking REUSE compliance..."
+reuse lint
+