Background
Robert Jacobsen was a developer of free, open-source software for model railroads, distributed under the Artistic License — an open-source license that allowed free use, modification, and distribution provided that certain attribution requirements were met, including preserving copyright notices, providing access to modified source code, and crediting the original authors. Matthew Katzer and his company Kamind Associates used Jacobsen’s open-source decoder software in commercial products they sold — without complying with the attribution and source-availability conditions of the Artistic License.
Jacobsen sued for copyright infringement, arguing that Katzer had exceeded the scope of the copyright license by violating its conditions. Katzer argued that the license terms were merely contractual covenants, not conditions on the license grant itself — meaning a violation gave rise only to breach of contract damages, not copyright infringement. This distinction mattered enormously: copyright infringement can be enjoined and carries statutory damages of up to $150,000 per work; breach of contract carries only actual damages.
The Court’s Holding
The Federal Circuit reversed the district court’s denial of a preliminary injunction and held that the conditions of the Artistic License were copyright conditions, not mere contractual covenants. The court distinguished between conditions on a copyright license grant (which limit the scope of the license, so that violation constitutes infringement) and covenants (which are contractual promises that, if breached, give rise to contract claims but do not automatically constitute infringement).
The court found that the Artistic License’s terms — requiring attribution, preservation of copyright notices, and source code availability — were conditions on the right to copy and distribute the software. When Katzer failed to comply with these conditions, he exceeded the scope of his license and was therefore using the software without authorization — which is copyright infringement, not merely breach of contract. The copyright owner’s full range of remedies, including injunctive relief and statutory damages, was available.
Key Takeaways
- Open-source license terms that are framed as conditions on the grant of a copyright license — rather than as independent contractual promises — give rise to copyright infringement (not just breach of contract) when violated.
- The distinction between conditions and covenants in a license agreement is critical: conditions limit the scope of the license grant and define when the licensee acts without authorization; covenants are independent contractual obligations whose breach does not necessarily constitute infringement.
- Copyright remedies — including injunctions and statutory damages up to $150,000 per work — are available when a licensee violates a condition on an open-source copyright license, making open-source license enforcement more powerful than pure breach-of-contract remedies.
- The ruling confirmed that open-source licenses like the GPL, LGPL, Artistic License, and Apache License are legally enforceable and that compliance with their terms is not optional for commercial users of open-source software.
Why It Matters
Jacobsen v. Katzer was a landmark ruling for the global open-source software community. Before this decision, some companies had adopted the position that open-source license terms were merely contractual covenants with limited enforcement tools — meaning that using open-source code without attribution or without releasing modifications under the required terms might result in a small damages award but not an injunction or statutory damages.
The Federal Circuit’s ruling destroyed that argument. By holding that license conditions in open-source licenses are copyright conditions, the court gave the open-source community the full enforcement power of copyright law. The practical consequence was significant: commercial software developers who incorporate open-source code into proprietary products must carefully comply with all license conditions — attribution, notice preservation, copyleft requirements — or face copyright infringement exposure with all its remedies. This remains the foundational legal precedent for open-source license enforcement in the United States.