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checking-license-compliance

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Audit a project's dependency licenses against an explicit policy (allow-list / deny-list / review-required) and flag incompatibilities before they ship to production. Reads SPDX license identifiers from npm package manifests, Python METADATA / PKG-INFO files, and pyproject.toml; classifies each license by family (permissive, weak-copyleft, strong-copyleft, proprietary, unknown); detects copyleft contamination and SPDX-incompatible license combinations. Use when: pre-release legal review, M&A code-audit due diligence, preparing an OSS attribution NOTICE file, or switching a project's own license. Threshold: any GPL-family license in a project declaring MIT or Apache-2.0; any UNKNOWN-license package; any metadata-vs-source license mismatch. Trigger with: "check licenses", "license compliance audit", "SPDX scan", "GPL contamination check".

skills/.curated/checking-license-compliance/SKILL.md

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Nov 12, 2026
License
MIT

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# Checking License Compliance

## Overview

License compliance is a security concern only in the indirect sense
that an unintended license obligation can force you to release
proprietary source code, retroactively invalidate a customer
contract, or render an M&A transaction infeasible. The cost is
legal and contractual rather than exploitative — but the
consequence ladder is real.

The most-stepped-on landmine is **copyleft contamination**:
unintentionally including a GPL or AGPL-licensed package in a
codebase the rest of which is permissively licensed (MIT, Apache-2.0,
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