License Compliance

When NOT to Use This Skill

• Security vulnerabilities - Use supply-chain skill for dependency security
• Code quality issues - Use quality skills for linting/complexity
• Secrets in dependencies - Use secrets-management skill
• Package integrity - Use supply-chain for SBOM and verification

Deep Knowledge: Use mcp__documentation__fetch_docs with technology: spdx for comprehensive documentation.

Official References

License Categories

By Permissiveness

Common SPDX Identifiers

Compatibility Matrix

Inbound → Outbound

Incompatibilities

NPM License Auditing

license-checker

# Install
npm install -g license-checker-rseidelsohn

# Basic scan
license-checker

# JSON output
license-checker --json > licenses.json

# Summary only
license-checker --summary

# Production only
license-checker --production

# Exclude dev dependencies
license-checker --production --json

Allowlist Configuration

# Only allow specific licenses
license-checker --onlyAllow "MIT;Apache-2.0;BSD-3-Clause;ISC;0BSD"

# Fail on copyleft licenses
license-checker --failOn "GPL-3.0;AGPL-3.0;GPL-2.0"

# Exclude packages
license-checker --excludePackages "internal-pkg@1.0.0"

@onebeyond/license-checker

npm install -g @onebeyond/license-checker

# Scan with allowlist
npx @onebeyond/license-checker scan --allowOnly MIT Apache-2.0 BSD-3-Clause

# Check SPDX compliance
npx @onebeyond/license-checker check "MIT OR Apache-2.0"

license-compliance

npm install -g license-compliance

# Check compliance
license-compliance --production --allow "MIT;ISC;Apache-2.0"

# Generate report
license-compliance --report licenses.csv

SBOM Generation

CycloneDX

# Install
npm install -g @cyclonedx/cyclonedx-npm

# Generate SBOM
cyclonedx-npm --output-file sbom.json

# Specific format
cyclonedx-npm --output-format XML --output-file sbom.xml

# Include dev dependencies
cyclonedx-npm --include-dev --output-file sbom.json

SPDX

# Using Syft
syft . -o spdx-json > sbom-spdx.json

# Verify SBOM
syft validate sbom-spdx.json

SBOM in package.json

{
  "name": "my-package",
  "version": "1.0.0",
  "license": "MIT",
  "licenses": [
    {
      "type": "MIT",
      "url": "https://opensource.org/licenses/MIT"
    }
  ]
}

CI Integration

GitHub Actions

name: License Compliance

on: [push, pull_request]

jobs:
  license-check:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: '20'

      - name: Install dependencies
        run: npm ci

      - name: Check licenses
        run: |
          npx license-checker-rseidelsohn \
            --production \
            --onlyAllow "MIT;Apache-2.0;BSD-3-Clause;BSD-2-Clause;ISC;0BSD;Unlicense;CC0-1.0" \
            --excludePrivatePackages

      - name: Generate SBOM
        run: |
          npx @cyclonedx/cyclonedx-npm --output-file sbom.json

      - name: Upload SBOM
        uses: actions/upload-artifact@v4
        with:
          name: sbom
          path: sbom.json

Pre-commit Hook

// package.json
{
  "scripts": {
    "license:check": "license-checker --production --onlyAllow 'MIT;Apache-2.0;BSD-3-Clause;ISC'",
    "preinstall": "npm run license:check || true"
  }
}

License File Templates

MIT License

MIT License

Copyright (c) [year] [fullname]

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

Apache 2.0 NOTICE

MyProject
Copyright [year] [owner]

This product includes software developed at
[Company Name] (https://www.example.com/).

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

Attribution Requirements

By License Type

Generating Attribution

# Generate NOTICES file
license-checker --production --customFormat '{"name": "", "version": "", "license": "", "repository": ""}' \
  | jq -r '.[] | "- \(.name)@\(.version) - \(.license)\n  \(.repository)\n"' \
  > NOTICES.md

NOTICES.md Template

# Third-Party Notices

This project includes the following third-party software:

## MIT License

### lodash (4.17.21)
- Repository: https://github.com/lodash/lodash
- Copyright (c) JS Foundation and other contributors

### axios (1.6.0)
- Repository: https://github.com/axios/axios
- Copyright (c) 2014-present Matt Zabriskie

## Apache-2.0 License

### typescript (5.3.0)
- Repository: https://github.com/microsoft/TypeScript
- Copyright (c) Microsoft Corporation

Risk Assessment

High Risk (Avoid in Proprietary)

Medium Risk (Review Carefully)

Low Risk (Generally Safe)

Checklist

Initial Setup

• Choose appropriate license for project
• Add LICENSE file to repository
• Add license field to package.json
• Configure license-checker in CI

Ongoing Compliance

• Audit new dependencies before adding
• Reject incompatible licenses in PR review
• Generate SBOM for releases
• Maintain NOTICES file
• Review license changes in updates

Release

• License file included in distribution
• Third-party notices generated
• SBOM attached to release
• No copyleft violations

Anti-Patterns

Quick Troubleshooting

Related Skills

• Supply Chain Security
• GitHub Actions