# Source and license notes

Reviewed 2026-08-30. Behavioral reference: [pinned upstream package](https://github.com/anthropics/knowledge-work-plugins/blob/8c3ec5534fc6948b461c6a0275bdfdb8ab0c9888/small-business/skills/crm-maintenance/SKILL.md). Repository license Apache-2.0. Workflow concepts were reviewed; all code and wording here are original.

Copied: nothing. Rewritten: all instructions, code, fixtures and classroom material. Prompthon adaptations: a distinct Operate boundary, tenant-scoped persistence, synthetic data, approval/readback safeguards, portable setup, English/Chinese exercises and reset behavior. The underlying openpyxl library is a declared dependency, not copied skill code.

See the [shared source audit](../../course-support/references/source-audit.json). Package-specific license conditions take precedence over an upstream repository's general license; in particular, xlsx material is not vendored.