Prusa's OCL: open source or hidden barrier?
The Open Community License (OCL) of Prusa Research redefines the boundaries between open sharing and commercial use, posing new dilemmas for the open source community.
The license that divides the community
The OCL introduces explicit commercial limitations that many consider incompatible with the fundamental principles of open source hardware.
Prusa Research published the OCL v1 on GitHub as an alternative to licenses born for software. The declared objective is to guarantee access and modifiability for the community, including the right to repair, while promoting fair competition by intervening on copyright, design, and patents.
The license allows non-commercial end users to use, copy, modify, and hack products and components. Modifications must be redistributed under the OCL or another non-commercial and share-alike compatible license.
- Non-commercial users: total freedom of modification, use, and sharing
- Companies: use allowed only for internal production use
- Prohibited: copying or replicating for commercial purposes without a separate license
- Prohibited: automated text and data mining activities without explicit permission
The most controversial part concerns business users. Companies can use and modify the product only for internal productive use. It is prohibited to modify components for commercial purposes other than internal use and to replicate the product or components without a separate license.
Many observers believe that these restrictions move the OCL outside the perimeter of standard open source definitions. The maker community, as reported by Make, would have preferred a discussion with OSI, Creative Commons, and OSHWA instead of introducing a new license.
Between ethics and business: the dilemma of open hardware
The goal is to protect community innovation without stifling legitimate business, but the boundary between openness and control remains tenuous.
The Open Source Hardware Association (OSHWA) defines open source hardware as hardware whose design allows anyone to study, modify, distribute, make, and sell the design or derived hardware. The definition explicitly requires that the license allow the production, sale, and distribution of derived products.
A non-commercial clause therefore makes the license incompatible with the open source hardware label according to OSHWA standards. This creates a fundamental tension: Prusa presents the OCL as open, but the community's established criteria say otherwise.
| Appearance | OCL | Open standard licenses |
|---|---|---|
| Personal use | Free | Free |
| Modifications | Allowed | Allowed |
| Commercial use | Internal only | Without restrictions |
| Sell derivatives | Forbidden | Allowed |
Michael Weinberg of the NYU Engelberg Center (board member OSHWA) has raised a legal-technical critique. The OCL risks conveying a maximalist idea of intellectual property: in hardware, many functional elements may not be covered by copyright.
A license text does not automatically turn what is not protectable as a creative work into something forbidden. Even with a restrictive license, the possibility of copying functional parts might remain, making the issue more complex than a simple license change.
Open source with conditions: a new model?
The OCL introduces a hybrid between open source and commercial control, with practical implications still little explored for makers, services, and companies.
Prusa justifies the choice by explaining that existing licenses do not work for hardware. GPL is too complex and forces allowing commercial exploitation. The Business Source License puts usage rights on a timer. Creative Commons explicitly exclude patent rights.
The OCL instead includes an explicit Patent License Grant, creating a safe harbor for those who use the files legitimately. It allows internal commercial use: you can make money using these designs to run your activity, but you cannot make money selling the licensed designs.
Under strict interpretations of non-commercial licenses, even a company that produces a spare part to repair its own production machine might violate the terms. The OCL seeks to solve this problem by explicitly allowing internal productive use.
In the real world, the difference between being able to modify for yourself and being able to produce and sell derivatives impacts multiple levels. For hobbyist makers, the OCL formalizes the freedom to modify and share in a non-commercial context. For services and companies, the internal use clause creates a gray area that requires case-by-case interpretation.
The OCL text is public on GitHub with open issues, a sign of a document that is still generating interpretive questions. The license also includes the intention to maintain a database of products and components released under OCL and good practices.
Conclusion
The OCL represents an ambitious but controversial shift in the open hardware landscape. Prusa seeks to resolve the dilemma between open sharing and commercial protection, but the result is a hybrid that many in the community refuse to call open source.
The tension between established definitions and new commercial needs is not resolved. The OCL may work for those seeking a source-available model with commercial control, but not for those who want to comply with OSHWA or OSI standards.
Join the discussion: is this license a step forward or a hidden limitation for open source? The debate is open, and the legal and practical implications are still being defined.
article written with the help of artificial intelligence systems
Q&A
- What is Prusa Research's Open Community License (OCL) and what is its stated goal?
- The OCL is a license published by Prusa Research on GitHub as an alternative to licenses born for software. Its stated goal is to guarantee access, modifiability, and the right to repair for the community, while introducing explicit commercial limitations to protect corporate innovation and promote fair competition on copyright, design, and patents.
- What are the main differences between OCL and standard open source hardware licenses according to OSHWA?
- Standard OSHWA licenses allow anyone to study, modify, make, and sell the design or derived hardware without commercial restrictions. The OCL, on the other hand, allows companies only internal productive use and prohibits the sale of derivatives without a separate license. This non-commercial clause makes the license incompatible with the official definition of open source hardware.
- What is allowed and what is forbidden to companies under the OCL terms?
- Companies are allowed to use and modify the product exclusively for internal productive use, including the production of spare parts for their own activity. It is forbidden to modify components for external commercial purposes, replicate products or components for sale, and conduct automated text and data mining activities without explicit permission.
- Why do many observers believe that the OCL is not compatible with the definition of open source?
- The consolidated definitions of OSI and OSHWA explicitly require that the license does not discriminate against commercial use and allows the sale of derived products. The OCL, however, limits commercial use to internal production only, excluding sale. Consequently, although presented as open, it violates the fundamental criteria of the open source communities.
- What is the criticism raised by Michael Weinberg regarding the OCL and intellectual property?
- Weinberg highlighted that the OCL risks taking a maximalist approach to intellectual property, ignoring that in hardware many functional elements are not covered by copyright. A restrictive license text cannot automatically prohibit what is not protectable as a creative work, making the issue more complex than a simple license change.
- How does the OCL address the right-to-repair theme compared to traditional non-commercial licenses?
- The OCL addresses right-to-repair by explicitly allowing internal productive use, including the production of spare parts to repair one's own machine. Under strict interpretations of other non-commercial licenses, even this activity could constitute a violation. In this way, the OCL seeks to formalize a practical exception for corporate maintenance while maintaining the prohibition on external commercial sale.
