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A mosaic of self-contained knowledge units. Hover any block to expand its full entry.

Featured Entry · Licenses

The Anatomy of a Software License

Grant, scope, term, royalty, warranty, indemnity. Every license, dissected.

A software license is a contract that defines the boundary between what a copyright holder permits and what remains reserved. Across permissive, copyleft, source-available, and proprietary models, six clauses recur with surprising consistency.

  • Grant. The verbs that matter: use, copy, modify, distribute, sublicense.
  • Scope. Geographic, temporal, and field-of-use restrictions.
  • Term & termination. Perpetual vs. fixed; cure periods.
  • Royalty & consideration. Up-front, runtime, milestone, or zero.
  • Warranty & disclaimer. "AS IS" defaults and their limits.
  • Indemnity. Who absorbs third-party claims.

Cross-references: Permissive licenses, Copyleft, Patent grant, Source-available.

SPDX-License-Identifier: MIT OR Apache-2.0
Rights

Moral Rights vs. Economic Rights

Two parallel tracks of authorship that licenses rarely cleanly separate.

Most jurisdictions recognize two parallel rights of authorship: economic rights, which are transferable, and moral rights, which often are not. The Berne Convention enshrines paternity and integrity; the U.S. Visual Artists Rights Act (VARA) is a narrower analog.

See also: Berne Convention, VARA 1990, Droit de suite.

Licenses

MIT License

One of the shortest and most permissive open-source licenses. 162 words. Permits use, modification, and redistribution with attribution. No copyleft. No patent grant.

SPDX: MIT · FSF: Yes · OSI: Yes
Licenses

Apache 2.0

Permissive license with explicit patent grant and termination on patent litigation. Requires retention of NOTICE files. Compatible with GPLv3.

SPDX: Apache-2.0
Exchange

Sublicense Chains

When a license travels through three parties before reaching its end user.

Sublicensing creates a directed graph of permissions. Each downstream node inherits a subset of the upstream grant. The chain breaks if the original grant is revoked, but well-drafted sublicenses include independent termination clauses.

Compare: Direct license, Patent exhaustion.

Rights

Right of Publicity

The right of an individual to control the commercial use of their identity -- name, likeness, voice. State-level in the U.S.; some descend post-mortem (Indiana: 100 years).

Featured Case · Cases

Jacobsen v. Katzer (2008)

When the Federal Circuit held that open-source license terms are conditions, not covenants -- making infringement, not just breach, the remedy.

The case turned on the Artistic License governing the Java Model Railroad Interface. The district court treated the attribution clause as a covenant, leaving plaintiffs only with breach-of-contract damages. The Federal Circuit reversed: the license's "provided that" language created a condition. Violation thus stripped the defendant of authorization, exposing them to copyright remedies including injunction.

  • Holding. Open-source attribution clauses are conditions of the grant.
  • Effect. Statutory damages and injunctive relief became available against violators.
  • Echoes. Cited in Versata v. Ameriprise and Artifex v. Hancom.
535 F.3d 1373 (Fed. Cir. 2008)

Cross-references: Condition vs. covenant, Artistic License, Open source enforcement.

Standards

SPDX Identifiers

The Software Package Data Exchange registry assigns canonical short identifiers to licenses. Now an ISO/IEC standard (5962:2021).

SPDX-License-Identifier: GPL-3.0-or-later
Policy

Compulsory Licensing

When the public interest overrides exclusive rights -- and at what statutory rate.

Compulsory licenses force a rights-holder to grant a license at a government-set rate. Used in pharmaceuticals (TRIPS Article 31), music mechanicals (17 U.S.C. § 115), and cable retransmission. The rate is the policy lever.

See also: TRIPS Agreement, Statutory rate.

Glossary

Estoppel

An equitable doctrine that prevents a party from asserting a right inconsistent with a position they previously took, when another party reasonably relied on that earlier position.

Rights

Joint Authorship

Each joint author owns an undivided share in the whole work and may license it independently, subject to a duty to account to co-authors for profits.

Exchange

Cross-Licensing

When two patent holders trade access instead of money.

A negotiated exchange where two parties grant each other reciprocal licenses to overlapping patent portfolios. Common in semiconductors and telecommunications. Reduces transaction costs and forestalls litigation, but can entrench incumbents.

See: FRAND, Patent pool.

Standards

FRAND Terms

"Fair, reasonable, and non-discriminatory." A licensing commitment required for patents declared essential to industry standards (4G, 5G, Wi-Fi, H.265).

Glossary

Field of Use

A scope restriction limiting a license to specified domains -- e.g., "non-commercial research," "consumer electronics," "medical diagnostics." Enforceable if reasonable.

Policy

Fair Use Factors

Four-factor test from 17 U.S.C. § 107: purpose, nature, amount, and market effect. Transformativeness has dominated courts' analysis since Campbell v. Acuff-Rose (1994).

Cases

Google v. Oracle (2021)

The Supreme Court declared the reuse of 11,500 lines of Java API a transformative fair use.

After more than a decade of litigation, the Supreme Court held 6-2 that Google's use of the Java SE API in Android was a fair use. The opinion sidestepped whether APIs are copyrightable, ruling instead on the fourth factor with new emphasis on industry-specific functionality.

593 U.S. ___ (2021)
Exchange

Patent Pool

A consortium of patent holders that aggregates licenses into a one-stop offering. MPEG LA (video codecs) and Via Licensing (audio) are exemplars.

Licenses

GPLv3

Strong copyleft license with explicit anti-tivoization, patent retaliation, and DRM-circumvention clauses. Compatible with Apache 2.0.

SPDX: GPL-3.0-or-later
Standards

CC BY-SA 4.0

Creative Commons Attribution-ShareAlike. Permits any use with attribution; derivatives must use the same license. Compatible with GFDL and freely-licensed Wikipedia content.

Glossary

Exhaustion Doctrine

Once sold, a copy walks free. The first-sale rule, in long form.

An authorized first sale of a particular copy or article exhausts the IP holder's distribution right over that copy. Foundational to the secondary market in books, recordings, and -- after Impression Products v. Lexmark (2017) -- patented goods.

Policy

Orphan Works

Copyrighted works whose rights-holder cannot be identified or located. Several jurisdictions (EU, Canada) have enacted limited-licensing schemes for them.