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---
name: external-code
description: >-
Check licensing, attribution, and derivation rights before copying, adapting, vendoring, or using outside code as an implementation reference.
grounded: 2026-10-09
written: 2026-10-09
---
# External code
1. Identify the exact source revision and license before derivation.
2. Resolve missing, restrictive, copyleft or source-available rights before copying.
3. Preserve required copyright, license, attribution and notices.
4. Record source, revision, license, reused scope and obligations.
5. When you adopt or test an outside source, add its entry to the repository's `docs/references.md`, when it has one, in the same commit.
Read [rights and record format](references/notes.md) when distinguishing facts from expression.
