# ADR-0007: Licence split — EUPL 1.2 kernel, Apache 2.0 contracts

• Status: accepted
• Date: 2026-04-23

# Context

The programme requires a public reference implementation. Commercial integrators asked for a licence that doesn't force them to release every derived product.

# Decision

• Protocol-critical code (kernel, crypto, crypto-ca, events, policy, observability, services): EUPL 1.2.
• Protocol contracts (@bdi/contracts): EUPL 1.2 AND Apache 2.0 (licensee chooses at redistribution time).

# Consequences

• Commercial adopters can build atop @bdi/contracts without EUPL copyleft obligations.
• Core behavioural code stays open.
• Each source file carries an SPDX header identifying the licence(s).