Clearance Manifest v0.1 rule registry (non-normative baseline)

This is the v0.1 baseline of recognised determination rules for the basis.rule field defined in spec.md. It is non-normative and deliberately conservative: it lists the rules a v0.1-baseline clearance corpus is expected to recognise (the CC0 and Public Domain truth tables, plus the fail-closed default), not the full set a producer may emit.

Every rule id is a bare kebab-case token that resolves as a fragment under this document's permanent URL:

https://openclearance.org/v0.1/rules#<rule-id>

For example, cc0-grants-commercial resolves to https://openclearance.org/v0.1/rules#cc0-grants-commercial.

What is normative and what is not

The spec normatively defines only the shape of basis:

"basis": {
  "rule":    "cc0-grants-commercial",          // string, required: a stable rule id
  "inputs":  [{ "field": "license.type", "value": "CC0" }],  // array, required: the evidence
  "summary": "CC0 public-domain dedication permits all uses, including commercial."  // required
}

rule, inputs, and summary are all required: honesty-by-architecture. A determination that cannot name its rule, cite its inputs, and state its reasoning is not a valid determination.

This registry (the meaning of each rule id and its truth-table outcome) is not part of the schema. The set of rule ids is open, not a closed enum:

• A basis.rule whose id is listed below is a recognised v0.1-baseline determination.
• A basis.rule whose id is not listed below is still a structurally valid Clearance Manifest. A conforming verifier emits a non-fatal unrecognised_rule advisory (mirroring the PIF unrecognised_token contract; see the advisory contract in spec.md); it MUST NOT reject the document for an unrecognised rule id.
• This separation encodes the design principle that structural validity (schema rejects) is independent of determination-rule recognition (verifier emits a non-fatal advisory).

How to read this list

• The registry grows by PR. A new permissive-license truth table is a new set of rule ids plus a test; it needs no schema change. Propose additions per the governance process.
• Rule ids are stable and immutable within a version. Once published at https://openclearance.org/v0.1/rules, a rule id's meaning is frozen. A corrected or expanded truth table ships as a new spec version, never by editing a published rule in place. (See ../VERSIONING.md.)
• Fail-closed is the contract. Any license signal that is missing, ambiguous, or not on this permissive list resolves to default-deny: every clearance boolean false, confidence: low, and the failing value carried verbatim in inputs.

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CC0: Creative Commons Zero (https://creativecommons.org/publicdomain/zero/1.0/)

The rights holder has waived all copyright and related rights worldwide. All downstream uses are permitted; no attribution is legally required.

Rule id	Asserts	Keys on (inputs)	Outcome
cc0-grants-commercial	clearance.commercialReproduction.permitted	license.type = CC0	true
cc0-grants-derivatives	clearance.derivatives.permitted	license.type = CC0	true
cc0-waives-attribution	clearance.attributionRequired.required	license.type = CC0	false

Public Domain: Public Domain Mark (https://creativecommons.org/publicdomain/mark/1.0/)

The work carries no known worldwide copyright (Creative Commons Public Domain Mark). The engine emits license.type = PD only for the worldwide Public Domain Mark (Europeana rights) and the Wikimedia PD/PDM templates, never a jurisdiction-scoped rightsstatements.org value such as NoC-US, which claims a narrower (US) scope the gate does not assert. All downstream uses are permitted; no attribution is legally required.

Rule id	Asserts	Keys on (inputs)	Outcome
pd-grants-commercial	clearance.commercialReproduction.permitted	license.type = PD	true
pd-grants-derivatives	clearance.derivatives.permitted	license.type = PD	true
pd-waives-attribution	clearance.attributionRequired.required	license.type = PD	false

Fail-closed default

Applied to every clearance dimension whenever the license signal is missing, ambiguous, or not one of the permissive rows above (e.g. CC-BY, CC-BY-SA, OTHER, UNKNOWN, or a value the engine could not resolve at all).

Rule id	Asserts	Keys on (inputs)	Outcome
default-deny	all of commercialReproduction.permitted, derivatives.permitted, attributionRequired.required	the unrecognised or absent license value, carried verbatim	false

Under default-deny, attributionRequired.required is false not because attribution is waived but because there is no cleared use to attribute: the deny is total. confidence is always low and the summary names the exact value that failed to clear.

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Why CC-BY / CC-BY-SA are not (yet) baseline rules

v0.1 of the reference engine only emits CC0 and PD with confidence: high. Attribution- and share-alike-bearing licenses (CC-BY, CC-BY-SA) require additional clearance facets (attributionRequired: true with a specific credit string, a shareAlikeRequired facet) that the v0.1 truth tables do not yet model. Until those facets and their rules are defined, such licenses resolve to default-deny: fail-closed, never a partial guess. Adding them is a future registry PR, not a schema change.