This bundle mixes three kinds of material, and they carry different terms.

Documents (*.md)
    Creative Commons Attribution 4.0 International (CC BY 4.0)
    https://creativecommons.org/licenses/by/4.0/
    Same terms as the SEAL protocol specification, so that a bundle and the
    spec it cites can travel together.

Code (attesters/*.py, tests/*.py, .github/**)
    Apache License 2.0
    https://www.apache.org/licenses/LICENSE-2.0
    An attester exists to be re-run by whoever received the claim, so the
    licence must not be the reason they cannot.

Certificates (references/certs/*)
    These are issued records, not licensed works. They may be copied and
    redistributed verbatim as evidence. They may not be modified and passed
    off as issued — and a modified certificate fails verification anyway,
    which is the point of the format.

"SEAL" as the name of a conformant implementation is subject to the naming
terms in the specification repository: https://github.com/playidea-lab/seal-spec
