lrx.wiki

The structure of the work follows the structure of the field itself: foundations first, vocabulary next, then the wire-level protocols, and finally the questions of practice that arise when standards meet circumstance. Cross-references are given by chapter and section in the manner of the older legal and ecclesiastical compendia.

What follows is neither a manual nor an advocacy document. It is a reference. The reader who wishes to know what an attribution chain is, how a transferable license is encoded, or what the terms licensor, licensee, and downstream party have come to mean in current practice — that reader is the intended audience.

1.1 Parties and Their Names

Three parties recur throughout the literature. The licensor is the party from whom rights flow: typically the author, but in practice often a publisher, estate, or collective management organization acting under prior assignment. The licensee is the party to whom rights flow. The downstream party is any subsequent recipient of rights derived from the licensee's grant — a sub-licensee, a re-publisher, or, in the open-license tradition, the unbounded public.

The terminology is not uniform across jurisdictions. Continental European treatments often prefer conceder and concessionary; the British tradition retains the older grantor and grantee; and, in the United States, both pairs appear interchangeably alongside the licensor / licensee form preferred here.

A license is the smallest unit of rights traffic — a single grant, witnessed, recorded, and capable of being either transferred or extinguished but never erased.

1.2 The Three Components of a Grant

Every well-formed license contains three components, often described in the literature as the scope, the term, and the consideration. The scope delimits what the licensee may do — reproduce, distribute, perform, display, modify, sub-license, or some combination thereof. The term delimits when — a fixed period, a renewable interval, a perpetual grant, or, in the case of certain irrevocable licenses, the lifetime of the work itself. The consideration delimits what the licensor receives in return — money, attribution, reciprocal license, or, in the case of pure dedications, nothing.²

1.3 Recording and Provenance

A grant unrecorded is, in most modern frameworks, a grant unenforceable. The provenance chain — the documented sequence of transfers from original author to current rightsholder — has accordingly become the central artifact of rights exchange. Section III treats provenance in detail; here it suffices to note that the chain must be both continuous (no missing links) and consistent (no contradictory grants) to be considered well-formed.

2.1 Permissive Licenses

A permissive license imposes few obligations on the licensee beyond attribution. The canonical examples include the MIT, BSD, and Apache families in software, and the CC-BY family in cultural works. The defining feature is that downstream parties remain free to relicense, including under more restrictive terms.

2.2 Reciprocal Licenses

A reciprocal license — sometimes termed copyleft in the software tradition — requires that derivative works be distributed under the same license as the original. The mechanism is contractual rather than statutory: the license simply withholds permission to redistribute except on the original terms. The GPL and the CC-BY-SA are the prototypical instances.¹

Reciprocity is not a restriction on the licensee's freedom; it is a restriction on the licensee's power to restrict others.

2.3 Restrictive Licenses

A restrictive license withholds rights that would otherwise be granted by default. The category is heterogeneous, encompassing time-limited, territory-limited, medium-limited, and use-limited grants. Of particular note are non-commercial licenses, whose definition has occasioned more litigation per word of license text than any other class.

2.4 Dedications and Waivers

At the limit of the spectrum lie the dedications — instruments by which the licensor relinquishes some or all rights into the public domain. The CC0 dedication is the most widely deployed example. A waiver, properly speaking, is narrower: a relinquishment of a specific right (for instance, the right to enforce attribution) without an accompanying transfer.

3.1 The C2PA Manifest

The Coalition for Content Provenance and Authenticity (C2PA) manifest format has, since its 2021 publication, become the most widely adopted standard for embedding provenance assertions directly within media files. A manifest contains assertions about origin, modifications, and rights, each cryptographically signed and chained to predecessors.¹

3.2 ODRL and the Rights Expression Languages

The Open Digital Rights Language (ODRL), now a W3C recommendation, provides a vocabulary for expressing licenses in machine-readable form. An ODRL policy describes permissions, prohibitions, and obligations as triples; the result is a structured representation amenable to automated reasoning, validation, and aggregation.

What the printing press did for the diffusion of works, the rights-expression languages may yet do for the diffusion of permissions.

3.3 Provenance Chains

A provenance chain is constructed by appending, at each transfer, a new signed assertion to the existing record. Validation proceeds backward from the present holder to the original licensor, verifying signatures and confirming the consistency of successive grants. A break in the chain — a missing signature, an inconsistent grant, an expired key — renders the holder's title presumptively defective.

3.4 Interoperability Profiles

Because no single protocol covers the full range of rights-exchange use cases, the practice has developed of profiles: specifications that constrain the use of a base protocol for a particular domain. Examples include the journalism-oriented C2PA profile, the museum-oriented IIIF rights extension, and the music-industry DDEX profile.

4.1 The Doctrine of Least Surprise

Where a license is ambiguous, the prevailing convention is to construe it in the manner least surprising to a reasonable licensee acquainted with the relevant tradition. The doctrine has been formally adopted in only a handful of jurisdictions, but it is invoked, in practice, almost universally.

4.2 Attribution Chains

An attribution chain records the human-readable credit due to each contributor in a provenance chain. It is by convention rendered in chronological order, with the original author first and the most recent contributor last. Brevity is preferred: the canonical form is Author / Modifier / Modifier, separated by solidi, with hyperlinks where available.

4.3 The Question of Implicit Licenses

A persistent question of practice concerns the inference of licenses where none is explicit — for instance, the implicit license to read an HTML document conveyed by its mere publication. Practice has converged on a narrow construction: the implicit license extends to ordinary consumption and quotation, but not to mass redistribution or training of automated systems. The latter point remains disputed and is the subject of active litigation in several jurisdictions.¹

Convention is what custom looks like once it has held its ground long enough to be cited.