r-efi 5.3.0 - license material provenance

Declared license: MIT OR Apache-2.0 OR LGPL-2.1-or-later

UNRESOLVED DETAIL: the published crate does NOT ship a license file; the
license is asserted only through Cargo.toml metadata. Texts here are the
canonical standard texts, added so the distribution carries usable text
matching the declared license. Marked declared-only, not upstream-collected.
