D003 - Permissive licence and permissive dependencies

Status: decided Date: 2026-09-26

orbistoun is MIT OR Apache-2.0, and deny.toml admits only permissive dependency licences plus MPL-2.0. A data or font licence on a crate that ships data rather than code is a scoped per-crate exception with its reason written beside it.

Why: preventing closed forks is not a goal, and a GPL dependency would relicense the binary. MPL-2.0 is file-level copyleft: it covers modifications to its own files, never this code. A data licence argument does not transfer to a code dependency under the same identifier, so it is granted per crate rather than globally.

Rejected:

• GPL or AGPL: binary-level copyleft over the whole emulator.
• Dropping MPL-2.0 crates for hand-written replacements: worse code for a concern that does not apply.
• A blanket allowance for data licences: it would admit code under the same identifier.